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.
Applications
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  |
| 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 |
| 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 |
| 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 |
| 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 |
| Max. Current Efficiency | 44.0 cd/A |
| Max. Power Efficiency | 46.1lm W−1 |
| Max. EQE | 14.5% |
Literature and Review
- 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.
- 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.
- 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.
- 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.
- 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.