🌈 Comprehensive Fluorophore Selection Guide

A vendor-neutral reference for 100+ fluorophores used in flow cytometry — organized by laser line with excitation/emission data, relative brightness, and vendor availability.

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Table of Contents

  1. How to Use This Guide
  2. UV Laser (355 nm) Fluorophores
  3. Violet Laser (405 nm) Fluorophores
  4. Blue Laser (488 nm) Fluorophores
  5. Yellow-Green Laser (561 nm) Fluorophores
  6. Red Laser (633/640 nm) Fluorophores
  7. Viability & DNA-Binding Dyes
  8. Tandem Dye Reference
  9. Brightness Ranking & Panel Design
  10. Cross-Vendor Equivalents
  11. Interactive Spectrum Viewer Tool
  12. Troubleshooting & Tips

📚 How to Use This Guide

This comprehensive, vendor-neutral fluorophore selection guide covers dyes from all major manufacturers including Thermo Fisher/Invitrogen, BD Biosciences, BioLegend, Beckman Coulter, Cytek, Bio-Rad, Miltenyi Biotec, and Sony. Fluorophores are organized by their primary excitation laser line.

Key Information for Each Fluorophore

💡 Key Point: Brightness rankings are approximate and can vary by instrument, laser power, detector sensitivity, and filter configuration. Always validate fluorophore performance on your specific cytometer.

Brightness Scale

⭐⭐⭐⭐⭐ (5)

Very Bright
Best for low-expression markers. Examples: PE, BV421, PE-Cy7

⭐⭐⭐⭐ (4)

Bright
Good for low-to-medium markers. Examples: APC, BV605, BV711

⭐⭐⭐ (3)

Medium
Suitable for medium markers. Examples: APC-Cy7, PerCP-Cy5.5

⭐⭐ (2)

Dim
Reserve for high-expression markers. Examples: FITC, BV510

⭐ (1)

Very Dim
Only for very high-expression markers. Examples: PerCP, BUV395

🌈 Open Interactive Spectrum Viewer Tool →

🔼 UV Laser (355 nm) Fluorophores

Ultraviolet-excitable dyes are essential for expanding multicolor panels beyond what violet, blue, and red lasers alone can achieve. Many UV dyes are polymer-based and offer minimal spillover into other laser channels.

UV Dye Table
Fluorophore Ex Max (nm) Em Max (nm) Brightness Type Vendor(s) Notes
BUV395 348 395 ⭐⭐⭐ Polymer BD Base polymer; minimal spillover. Filter: 379/28
Spark UV 387 341 387 ⭐⭐ Small Molecule BioLegend Alternative to Alexa Fluor 350 for UV laser
cFluor UV395 ~350 395 ⭐⭐⭐ Polymer Cytek Equivalent to BUV395
BUV496 348 496 ⭐⭐⭐ Polymer Tandem BD BUV395 + acceptor. Filter: 515/30
cFluor UV440 ~350 440 ⭐⭐ Polymer Tandem Cytek UV laser tandem
cFluor UV515 ~350 515 ⭐⭐ Polymer Tandem Cytek UV laser tandem
BUV563 351 563 ⭐⭐⭐ Polymer Tandem BD BUV395 + acceptor. Filter: 562/40
cFluor UV570 ~350 570 ⭐⭐ Polymer Tandem Cytek UV laser tandem
BUV661 351 657 ⭐⭐⭐ Polymer Tandem BD BUV395 + acceptor. Filter: 670/30
cFluor UV610 ~350 610 ⭐⭐ Polymer Tandem Cytek UV laser tandem
cFluor UV670 ~350 670 ⭐⭐ Polymer Tandem Cytek UV laser tandem
BUV737 350 732 ⭐⭐⭐ Polymer Tandem BD BUV395 + acceptor. Filter: 740/35
cFluor UV745 ~350 745 ⭐⭐ Polymer Tandem Cytek UV laser tandem
cFluor UV790 ~350 790 ⭐⭐ Polymer Tandem Cytek UV laser tandem
BUV805 351 797 ⭐⭐ Polymer Tandem BD BUV395 + acceptor. Filter: 820/60
Alexa Fluor 350 346 442 ⭐⭐ Small Molecule Thermo Fisher Coumarin derivative; UV-excitable classic
DAPI 358 461 ⭐⭐⭐ DNA Dye Multiple DNA-binding; also excited at 405 nm. ~20x brighter when bound to DNA
Hoechst 33342 350 461 ⭐⭐⭐ DNA Dye Multiple Cell-permeable DNA dye; also excited at 405 nm
💡 Tip: UV laser dyes (355 nm) are ideal for expanding panels because they have minimal spectral overlap with violet laser-excited dyes. Instruments need a dedicated UV laser to use BUV and cFluor UV dyes.

🔼 Violet Laser (405 nm) Fluorophores

The violet laser offers an enormous number of polymer and tandem dyes spanning 420–780 nm emission, making it the most versatile single laser for multicolor panels. Brilliant Violet (BV), Super Bright (SB), and cFluor V dyes all use this laser.

Fluorophore Ex Max (nm) Em Max (nm) Brightness Type Vendor(s) Notes
Alexa Fluor 405 402 421 ⭐⭐ Small Molecule Thermo Fisher Cascade Blue equivalent
BV421 407 421 ⭐⭐⭐⭐⭐ Polymer BD BioLegend One of the brightest fluorophores; ~10x brighter than Pacific Blue. Filter: 450/40
Spark Violet 423 ~405 423 ⭐⭐⭐ Polymer BioLegend Similar to Super Bright 436
Super Bright 436 405 436 ⭐⭐⭐⭐ Polymer Thermo Fisher Base donor polymer dye. Filter: 450/50
cFluor V420 405 420 ⭐⭐ Small Molecule Cytek Similar to Alexa Fluor 405
cFluor V435 405 436 ⭐⭐⭐⭐ Nanoparticle Cytek Equivalent to Super Bright 436
eFluor 450 405 450 ⭐⭐⭐ Small Molecule Thermo Fisher Similar to Pacific Blue, V450. Filter: 450/50
Pacific Blue 401 452 ⭐⭐⭐ Small Molecule Thermo Fisher Classic violet-excitable dye
cFluor V450 405 450 ⭐⭐⭐ Small Molecule Cytek Equivalent to Pacific Blue / eFluor 450
VioBlue 400 452 ⭐⭐⭐ Small Molecule Miltenyi Miltenyi equivalent to Pacific Blue
cFluor V475 405 479 ⭐⭐⭐ Nanoparticle Cytek Similar to BV480
BV480 436 478 ⭐⭐⭐ Polymer BD Polymer dye between BV421 and BV510
Spark Violet 500 393 500 ⭐⭐ Small Molecule BioLegend Similar to V500, AmCyan
BV510 405 510 ⭐⭐ Polymer BD BioLegend Brighter than V500. Filter: 525/40
cFluor V505 405 505 ⭐⭐ Small Molecule Cytek Similar to BV510, VioGreen
eFluor 506 405 506 ⭐⭐ Small Molecule Thermo Fisher Similar spectra to AmCyan and V500
Krome Orange 398 528 ⭐⭐⭐ Small Molecule Beckman Coulter Unique violet-excitable dye with green-yellow emission
Spark Violet 538 405 ~545 ⭐⭐ Small Molecule BioLegend Similar to Pacific Orange, Krome Orange
Pacific Orange 400 551 ⭐⭐ Small Molecule Thermo Fisher Violet-excited with yellow-orange emission
cFluor V547 405 547 ⭐⭐ Small Molecule Cytek CF405L equivalent; similar to Pacific Orange
BV570 405 570 ⭐⭐⭐ Polymer Tandem BD BioLegend BV421 + acceptor
Super Bright 600 405 600 ⭐⭐⭐ Polymer Tandem Thermo Fisher SB436 + acceptor. Filter: 610/20
BV605 407 605 ⭐⭐⭐⭐ Polymer Tandem BD BioLegend BV421 + acceptor. Very bright. Filter: 610/20
cFluor V605 405 605 ⭐⭐⭐⭐ Polymer Tandem Cytek Equivalent to BV605
Super Bright 645 405 645 ⭐⭐⭐ Polymer Tandem Thermo Fisher SB436 + acceptor. Filter: 660/20
BV650 407 650 ⭐⭐⭐⭐ Polymer Tandem BD BioLegend BV421 + acceptor. Filter: 660/20
cFluor V670 405 670 ⭐⭐⭐ Polymer Tandem Cytek StarBright Violet equivalent
Super Bright 702 405 702 ⭐⭐⭐ Polymer Tandem Thermo Fisher SB436 + acceptor. Filter: 710/50
BV711 407 711 ⭐⭐⭐⭐⭐ Polymer Tandem BD BioLegend BV421 + DY-682. Very bright. Filter: 710/50
cFluor V715 405 715 ⭐⭐⭐⭐ Polymer Tandem Cytek Equivalent to BV711
BV750 405 750 ⭐⭐⭐ Polymer Tandem BD BioLegend BV421 + acceptor
Super Bright 780 405 780 ⭐⭐ Polymer Tandem Thermo Fisher SB436 + acceptor. Filter: 785/60
BV786 407 786 ⭐⭐⭐ Polymer Tandem BD BioLegend BV421 + acceptor. Filter: 780/60
cFluor V780 405 780 ⭐⭐ Polymer Tandem Cytek Equivalent to BV786
⚠ Caution: When using multiple polymer dyes (BV, SB, cFluor V) in the same panel, you must use a Brilliant Stain Buffer (BD) or equivalent to prevent polymer-polymer interactions that cause increased background staining.

🔼 Blue Laser (488 nm) Fluorophores

The 488 nm blue laser is the most common laser in flow cytometry. It excites classic dyes like FITC, PE, and PerCP, as well as newer polymer alternatives like BB515 and Spark Blue dyes.

Fluorophore Ex Max (nm) Em Max (nm) Brightness Type Vendor(s) Notes
Alexa Fluor 488 495 519 ⭐⭐⭐ Small Molecule Thermo Fisher Brighter, more photostable FITC alternative
FITC 494 520 ⭐⭐ Small Molecule Multiple Most widely used dye; pH-sensitive, photobleaches. EC: 78,000; QY: 0.50
BB515 490 515 ⭐⭐⭐ Polymer BD Brighter than FITC, less PE spillover. Filter: 530/30
cFluor B515 ~490 515 ⭐⭐⭐ Small Molecule Cytek Equivalent to BB515, VioBright B515
Spark Blue 515 490 511 ⭐⭐ Small Molecule BioLegend Blue laser FITC alternative
Alexa Fluor 514 518 540 ⭐⭐ Small Molecule Thermo Fisher Rhodamine derivative
Spark Blue 550 516 550 ⭐ Small Molecule BioLegend Alternative to Alexa Fluor 532
Alexa Fluor 532 531 554 ⭐⭐ Small Molecule Thermo Fisher Green-yellow emission
PE (R-Phycoerythrin) 565 578 ⭐⭐⭐⭐⭐ Protein Multiple Brightest common fluorochrome. EC: 1,960,000; QY: 0.84. Also excited by 561 nm
PE-Dazzle 594 565 594 ⭐⭐⭐⭐ Protein Tandem BioLegend PE tandem with unique spectral signature
PE-CF594 565 594 ⭐⭐⭐⭐ Protein Tandem BD PE + CF594 acceptor dye
PE-Cy5 496 667 ⭐⭐⭐⭐⭐ Protein Tandem Multiple Very bright; significant spillover into APC channel
PE-Cy5.5 496 694 ⭐⭐⭐⭐ Protein Tandem Multiple PE tandem to far-red
PE-Cy7 565 778 ⭐⭐⭐⭐⭐ Protein Tandem Multiple Very bright but Cy7 is light-sensitive. Protect from light!
PE/Fire 810 565 810 ⭐⭐⭐ Protein Tandem BioLegend Far near-IR PE tandem
PerCP 482 678 ⭐ Protein Multiple Photobleaches on high-power lasers (>25 mW)
PerCP-Cy5.5 482 694 ⭐⭐⭐ Protein Tandem Multiple Much more photostable than PerCP alone. Common in panels
PerCP-eFluor 710 482 710 ⭐⭐⭐ Protein Tandem Thermo Fisher PerCP tandem shifted further red
BB700 485 693 ⭐⭐⭐ Polymer BD Brighter than PerCP-Cy5.5 with less cross-laser excitation
cFluor B690 ~488 690 ⭐⭐⭐ Tandem Cytek Equivalent to PerCP-Cy5.5, BB700
💡 Tip: PE is the brightest common fluorochrome — always assign it to your lowest-expressed antigen. FITC is relatively dim; reserve it for highly expressed markers like CD3, CD45, or viability dyes.

🔼 Yellow-Green Laser (561 nm) Fluorophores

The 561 nm yellow-green laser provides superior excitation of PE and its tandems compared to the 488 nm laser. It also enables use of unique dyes like Spark YG and cFluor YG that are spectrally distinct from PE.

Fluorophore Ex Max (nm) Em Max (nm) Brightness Type Vendor(s) Notes
PE (via YG) 565 578 ⭐⭐⭐⭐⭐ Protein Multiple Better excited by 561 nm than 488 nm; even brighter signal
Alexa Fluor 546 556 573 ⭐⭐⭐ Small Molecule Thermo Fisher Rhodamine derivative; PE alternative on YG laser
Alexa Fluor 555 555 565 ⭐⭐⭐ Small Molecule Thermo Fisher Cyanine-based; Cy3 alternative
Spark YG 570 555 570 ⭐⭐ Small Molecule BioLegend Alternative to Alexa Fluor 555 and Cy3
Spark YG 581 565 581 ⭐⭐ Small Molecule BioLegend Minimal blue laser excitation; unmixes from PE
cFluor YG584 ~565 584 ⭐⭐ Small Molecule Cytek Spectrally unique from PE; primarily YG-excited
Spark YG 593 574 593 ⭐⭐⭐ Small Molecule BioLegend Similar to BD RealYellow 586
Alexa Fluor 568 578 603 ⭐⭐⭐ Small Molecule Thermo Fisher Rhodamine derivative; orange-red
Alexa Fluor 594 590 617 ⭐⭐⭐ Small Molecule Thermo Fisher Texas Red alternative; very photostable
PE-Cy5 (via YG) 496 667 ⭐⭐⭐⭐⭐ Protein Tandem Multiple Better excited on YG laser than blue
PE-Cy7 (via YG) 565 778 ⭐⭐⭐⭐⭐ Protein Tandem Multiple Optimal excitation on YG laser. Protect from light!
💡 Key Point: In spectral cytometry, the YG laser (561 nm) allows PE and its tandems to be unmixed separately from blue laser-excited dyes, effectively doubling the number of usable dyes in that emission range.

🔼 Red Laser (633/640 nm) Fluorophores

Red laser-excitable dyes fill the far-red and near-infrared spectrum. APC is the anchor fluorophore, and numerous tandems and alternatives extend coverage to >800 nm.

Fluorophore Ex Max (nm) Em Max (nm) Brightness Type Vendor(s) Notes
APC (Allophycocyanin) 650 660 ⭐⭐⭐⭐ Protein Multiple Primary red laser dye; very bright for far-red
Alexa Fluor 647 650 668 ⭐⭐⭐ Small Molecule Thermo Fisher APC alternative; extremely photostable
eFluor 660 651 668 ⭐⭐⭐ Small Molecule Thermo Fisher Alternative to APC and Alexa Fluor 647
cFluor R659 ~640 659 ⭐⭐⭐⭐ Protein Cytek APC equivalent
cFluor R668 ~640 668 ⭐⭐⭐ Small Molecule Cytek CF647 equivalent; similar to Alexa Fluor 647
Spark NIR 685 665 685 ⭐⭐ Small Molecule BioLegend Fills gap between APC and Alexa Fluor 700
cFluor R685 ~640 685 ⭐⭐ Small Molecule Cytek Similar to APC-Cy5.5, Spark NIR 685
Alexa Fluor 660 663 690 ⭐⭐ Small Molecule Thermo Fisher Cyanine-based far-red dye
Alexa Fluor 700 702 723 ⭐⭐ Small Molecule Thermo Fisher Near-IR; dimmer than APC. Good for high-expression markers
cFluor R720 ~640 720 ⭐⭐⭐ Small Molecule Cytek CF700 equivalent; brighter than Alexa Fluor 700
Spark Red 718 697 711 ⭐⭐⭐⭐ Small Molecule BioLegend Brighter alternative to Alexa Fluor 700
APC-Cy7 650 785 ⭐⭐⭐ Protein Tandem Multiple Cy7 is light-sensitive. Protect from light!
APC-H7 650 785 ⭐⭐⭐ Protein Tandem BD More stable than APC-Cy7. BD proprietary
APC/Fire 750 650 750 ⭐⭐⭐ Protein Tandem BioLegend More stable APC-Cy7 alternative
APC-eFluor 780 645 780 ⭐⭐⭐ Protein Tandem Thermo Fisher High-performance APC tandem
cFluor R780 ~640 780 ⭐⭐ Protein Tandem Cytek APC-based tandem. Light-sensitive
APC/Fire 810 650 810 ⭐⭐ Protein Tandem BioLegend Furthest-red APC tandem from BioLegend
cFluor R840 ~640 840 ⭐ Protein Tandem Cytek Furthest near-IR APC tandem. Light-sensitive
⚠ Caution: All Cy7-containing tandems (PE-Cy7, APC-Cy7) and many near-IR tandems degrade with light exposure and fixation. Protect samples from light during staining and run quickly.

☠ Viability & DNA-Binding Dyes

Viability dyes distinguish live from dead cells, and DNA-binding dyes are used for cell cycle analysis. Choosing the right viability dye depends on whether you need to fix your samples.

Viability Dyes

Dye Ex Max (nm) Em Max (nm) Laser Fix-Compatible? Notes
Propidium Iodide (PI) 535 617 488 / 561 nm No (unfixed only) DNA-intercalating; bright. Not for fixed samples
7-AAD 549 648 488 nm No (unfixed only) Large Stokes shift; less overlap with FITC/PE than PI
DAPI 358 461 355 / 405 nm No (unfixed only) 20x fluorescence enhancement when DNA-bound
SYTOX Blue 431 480 405 nm No Dead cell stain; good for violet laser setups
LIVE/DEAD Aqua (FVD eFluor 506) 367 526 405 nm Yes Amine-reactive fixable dye. Violet-excited
LIVE/DEAD Violet (FVD eFluor 450) 416 451 405 nm Yes Amine-reactive fixable dye
LIVE/DEAD Near-IR (FVD eFluor 780) 753 785 633 nm Yes Amine-reactive fixable dye; minimizes spectral overlap
LIVE/DEAD Yellow 400 575 405 nm Yes Amine-reactive fixable; broad emission
Zombie Aqua ~400 516 405 nm Yes BioLegend fixable viability dye
Zombie NIR ~640 746 633 nm Yes BioLegend fixable viability dye
Zombie Violet ~400 423 405 nm Yes BioLegend fixable viability dye
ViaDye Red ~640 ~660 633 nm Yes Cytek fixable viability dye

DNA / Cell Cycle Dyes

Dye Ex Max (nm) Em Max (nm) Laser DNA Binding Notes
Propidium Iodide 535 617 488 / 561 nm Intercalator Gold standard for cell cycle; requires permeabilization or fixation
DAPI 358 461 355 / 405 nm Minor groove (AT) Can be used on UV or violet laser. Cell-impermeant
Hoechst 33342 350 461 355 nm Minor groove (AT) Cell-permeable; live-cell compatible
Hoechst 33258 352 461 355 nm Minor groove (AT) Cell-impermeant version
DRAQ5 647 681 488 / 633 nm Intercalator Cell-permeable; red-excited DNA dye
FxCycle Violet 369 437 405 nm Intercalator Thermo Fisher cell cycle dye for violet laser
💡 Tip: If you need to fix and permeabilize cells (e.g., for intracellular staining), use a fixable viability dye before fixation. Non-fixable dyes like PI and 7-AAD will dissociate during permeabilization.

🔗 Tandem Dye Reference

Tandem dyes combine a donor fluorophore with an acceptor dye via FRET (fluorescence resonance energy transfer). They extend the emission range of a single laser line but require careful handling.

Common Tandem Dye Families

PE Tandems

PE-Cy5, PE-Cy5.5, PE-Cy7, PE-CF594, PE-Dazzle 594, PE/Fire 810

Donor: PE (488/561 nm)

APC Tandems

APC-Cy7, APC-H7, APC/Fire 750, APC-eFluor 780, APC/Fire 810

Donor: APC (633 nm)

PerCP Tandems

PerCP-Cy5.5, PerCP-eFluor 710

Donor: PerCP (488 nm)

BV Tandems

BV570, BV605, BV650, BV711, BV750, BV786

Donor: BV421 (405 nm)

BUV Tandems

BUV496, BUV563, BUV661, BUV737, BUV805

Donor: BUV395 (355 nm)

SB Tandems

SB600, SB645, SB702, SB780

Donor: SB436 (405 nm)

⚠ Tandem Dye Handling Rules:
  • Protect from prolonged light exposure during staining and acquisition
  • Tandem degradation causes increased donor emission and decreased acceptor emission
  • Lot-to-lot variability is common — always titrate and match compensation controls to the same lot
  • Fixation can alter tandem spectra; run compensation controls under the same conditions as samples
  • Use BD Brilliant Stain Buffer when combining multiple polymer-based tandems

🌟 Brightness Ranking & Panel Design Tips

When building multicolor panels, match fluorophore brightness to antigen expression level. Here is a general brightness ranking for common dyes.

Brightness Tiers (General Guide)

Tier Fluorophores Best For
⭐⭐⭐⭐⭐ Very Bright PE, BV421, PE-Cy7, PE-Cy5, BV711, BV605 Low-expression markers (cytokines, transcription factors, rare subsets)
⭐⭐⭐⭐ Bright APC, BV650, PE-Dazzle 594, Super Bright 436, Spark Red 718 Low-to-medium expression markers
⭐⭐⭐ Medium PerCP-Cy5.5, APC-Cy7, BV570, BV786, BB515, BB700, Pacific Blue, eFluor 450 Medium expression markers (CD4, CD8, CD19)
⭐⭐ Dim FITC, BV510, Alexa Fluor 700, Alexa Fluor 488, Pacific Orange Highly expressed markers (CD3, CD45, lineage markers)
⭐ Very Dim PerCP, BUV395, Spark Blue 550 Very highly expressed markers only

Panel Design Principles

  1. Match brightness to expression: Brightest dye → lowest expressed antigen
  2. Minimize spectral overlap: Avoid pairing dyes with similar emission on the same laser
  3. Spread across lasers: Use all available lasers to reduce compensation requirements
  4. Consider spillover spreading: Bright dyes cause more spreading into neighboring channels
  5. Titrate all antibodies: Use the optimal concentration, not the vendor-recommended amount
  6. Use polymer staining buffer: Required when combining BV/SB/polymer dyes
  7. Run proper controls: Single-stain compensation controls, FMO controls for gating
💡 Key Point: Brightness depends on your specific instrument's laser power, detector sensitivity, and filter configuration. Always benchmark fluorophores on your own cytometer using titrated antibodies against positive controls.

🔄 Cross-Vendor Fluorophore Equivalents

Different vendors often produce fluorophores with nearly identical spectral properties but different names. Use this table to find equivalents across brands.

Spectral Region BD Biosciences Thermo Fisher BioLegend Cytek Beckman Coulter Miltenyi
UV ~395 nm BUV395 — Spark UV 387 cFluor UV395 — —
Violet ~421 nm BV421 Super Bright 436 Brilliant Violet 421 cFluor V435 — VioBlue
Violet ~450 nm V450 eFluor 450 / Pacific Blue — cFluor V450 — VioBlue
Violet ~510 nm BV510 eFluor 506 Brilliant Violet 510 cFluor V505 Krome Orange VioGreen
Violet ~605 nm BV605 Super Bright 600 Brilliant Violet 605 cFluor V605 — —
Violet ~650 nm BV650 Super Bright 645 Brilliant Violet 650 cFluor V670 — —
Violet ~711 nm BV711 Super Bright 702 Brilliant Violet 711 cFluor V715 — —
Violet ~786 nm BV786 Super Bright 780 Brilliant Violet 785 cFluor V780 — —
Blue ~520 nm BB515 Alexa Fluor 488 Spark Blue 515 cFluor B515 — VioBright FITC
Blue ~578 nm (PE) PE PE PE PE PE PE
Blue ~690 nm BB700 PerCP-eFluor 710 PerCP-Cy5.5 cFluor B690 — —
Red ~660 nm APC eFluor 660 / AF647 APC cFluor R659 APC APC
Red ~720 nm APC-R700 Alexa Fluor 700 Spark Red 718 cFluor R720 — —
Red ~780 nm APC-H7 APC-eFluor 780 APC/Fire 750 cFluor R780 APC-AF750 APC-Vio 770
💡 Tip: While spectrally similar, cross-vendor dyes may have different polymer compositions that affect staining performance. Always validate an equivalent dye on your instrument before substituting in a panel.

🌈 Interactive Spectrum Viewer Tool

Want to visually compare fluorophore excitation and emission spectra? Our interactive Spectrum Viewer lets you:

🌈 Launch Interactive Spectrum Viewer →

🔧 Troubleshooting & Tips

Common Issues

Problem Likely Cause Solution
High background with polymer dyes Polymer-polymer aggregation Add Brilliant Stain Buffer (BD) or equivalent to staining cocktail
Tandem dye degradation Light exposure during staining Stain in the dark; minimize time between staining and acquisition
Compensation errors Wrong compensation controls Use same antibody conjugate (or equivalent) on compensation beads; match lots
Dim staining on expected positive Sub-optimal titration or wrong clone Titrate antibody; try brighter fluorophore for low-expression markers
Spread from bright neighbors Spectral overlap spillover spreading Use fluorescence-minus-one (FMO) controls; rearrange panel to separate overlapping dyes
Inconsistent tandem emission Lot-to-lot variability Always match compensation bead lot to antibody lot; do not mix lots
Viability dye not working after fixation Used non-fixable dye (PI, 7-AAD) Switch to fixable viability dye (Zombie, LIVE/DEAD, FVD eFluor); stain before fixation

Quick Reference: Key Rules

  1. Always titrate your antibodies to find the optimal concentration
  2. Use FMO controls to set accurate gates for dim populations
  3. Protect tandem dyes from light at all times
  4. Use Brilliant Stain Buffer when combining multiple polymer dyes
  5. Run compensation controls under the same fixation conditions as your samples
  6. Assign your brightest fluorophores to your dimmest antigens
  7. Verify cross-vendor equivalents on your own instrument before swapping in a panel