Order Code: M2094A1
MSDS sheet


(excluding Taxes)


General Information

CAS number 155306-71-1
Chemical formula C26H26N2O2S
Molecular weight 430.56 g/mol
Absorption λmax  473 nm (in THF)
Fluorescence λem 506 nm (in THF)
HOMO/LUMO HOMO = 5.6 eV, LUMO = 3.0 eV [2]
Synonyms 10-(2-Benzothiazolyl)-2,3,6,7-tetrahydro-1,1,7,7-tetramethyl-1H,5H,11H-(1)benzopyropyrano(6,7-8-I,j)quinolizin-11-one, Coumarin 545T
Classification / Family Coumarins, Electron transport-layer (ETL) materials, Green dopant materials, Organic Light-Emitting Diodes (OLEDs), Organic photovoltaics (OPV), Organic electronics, Laser dyes, Sublimed materials

Product Details

Purity >99% (sublimed*)
TGA 228°C, Td ≥ 250 oC (5% weight loss)
Colour Pale yellow - Yellow red powder/crystals

*Sublimation is a technique used to obtain ultra pure-grade chemicals. For more details about sublimation, please refer to the Sublimed Materials for OLED devices page.


C545T chemical structure, Coumarin545T, 155306-71-1
Chemical Structure of C545T; CAS No. 155306-71-1



C545T (also known as Coumarin 545T) is a family member of Coumarins.

Coumarins have been studied extensively for their applications in electronic and photonic devices. They possess high emission yield, excellent photo-stability, variable absorption range, and good solubility. As such, coumarins are widely used as fluorescence probes, charge-transfer materials, and dyes for OLEDs, OPV and laser dye applications

C545T is commonly used for highly-efficient OLED devices as a green-emitting dopant and electron transport host material. With four methyl groups and enhanced solubility, Coumarin 545T is also used in laser dyes with increased laser conversion efficiencies at higher concentrations.


Device structure    

ITO /Mg (1 nm)/Cs2O:Bphen (11 nm)/Alq3 (30 nm)/C545T:Alq3 (30 nm)/NPB (60 nm)/WO3 (5 nm)/Al [1]

Colour Green  green
Max. Current Efficiency 23.7 cd/A
Max. Power Efficiency 12.4 lm W−1 

Device structure    

Fluorocarbon coated ITO/NPB (60nm) /0.8% C545T doped TPBA (940 nm) /DBzA (20 nm) /LiF (1 nm)/Al [2]

Colour Green  green
Max. Current Efficiency 29.8 cd/A
Max. Power Efficiency 32.3 lm W−1 
Max. EQE 9.9%

Device structure    

ITO/MoO3 (10 nm)/PEDOT:PSS (30 nm)/NPB(25 nm)/Alq3:C545T (35 nm)/Alq3 (35 nm)/LiF (1 nm)/Al (120 nm) [3]

Colour Green  green
Max. Current Efficiency 23.4 cd/A
Max. EQE 6.31%

Device structure  ITO/MoO3 (1 nm)/C545T-Alq3 (100 nm)/LiF (1 nm)/Al (100 nm) [4]
Colour Green  green
Max. Luminance 26,750 cd/m2 
Current Efficiency@100cd/m2 12.8 cd/A

Device structure    

ITO/TAPC (40 nm)/ TAPC:DPTPCz:0.2 wt% C545T (30 nm)/TmPyPB (50 nm)/LiF (1 nm)/Al (100 nm) [5]

Colour Green  green
Max. Current Efficiency 44.0 cd/A
Max. Power Efficiency 46.1lm W−1 
Max. EQE 14.5%

Literature and Review

  1. Highly efficient and stable inverted bottom-emission organic light emitting devices, T-Y. Chu et al., Appl. Phys. Lett., 89, 053503 (2006); doi: 10.1063/1.2268923.
  2. Green fluorescent organic light-emitting device with external quantum efficiency of nearly 10%, K. Okumoto et al., Appl. Phys. Lett., 89, 063504 (2006); doi: 10.1063/1.2266452.
  3. High-efficiency fluorescent organic light-emitting diodes with MoO3 and PEDOT:PSS composition film as a hole injection layer, H. Zhang et al., J. Mater. Chem. C, 2, 9620 (2014); DOI: 10.1039/c4tc01310g.
  4. Efficient Single-Layer Organic Light-Emitting Diodes Based on C545T-Alq3 System, Z. Liu et al., J. Phys. Chem. C, 114, 11931–11935 (2010); DOI: 10.1021/jp101269r.
  5. Nearly 100% Triplet Harvesting in Conventional Fluorescent Dopant-Based Organic Light-Emitting Devices Through Energy Transfer from Exciplex, X. Liu et al., Adv. Mater., 27, 2025–2030 (2015); DOI: 10.1002/adma.201500013.


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