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Product Code M2094A1-500mg
Price $350 ex. VAT

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C545T, for highly-efficient OLED devices as a green-emitting dopant

High-purity (>99.0%) and available online for priority dispatch

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.

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

* Measurable with an optical spectrometer, see our spectrometer application notes.

Product Details

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

* Sublimation is a technique used to obtain ultra pure-grade chemicals, see sublimed materials.

Chemical Structure

C545T chemical structure
Chemical Structure of C545T

Device Structure(s)

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 light emitting device
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 light emitting device
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 light emitting device
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 light emitting device
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 light emitting device
Max. Current Efficiency 44.0 cd/A
Max. Power Efficiency 46.1lm W−1 
Max. EQE 14.5%


Grade Order Code Quantity Price
Sublimed (>99% purity) M2094A1 500 mg £280
Sublimed (>99% purity) M2094A1 1 g £440

MSDS Documentation

C545T MSDSC545T MSDS sheet

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.

To the best of our knowledge the information provided here is accurate. The values provided are typical at the time of manufacture and may vary over time and from batch to batch. Products may have minor cosmetic differences (e.g. to the branding) compared to the photos on our website. All products are for laboratory and research and development use only.

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