Ir(ppy)2(acac)

Ir(ppy)2(acac), OLED material with high quantum yields

Higher external quantum efficiency than Ir(ppy)3

Like Ir(ppy)₃, bis[2-(2-pyridinyl-N)phenyl-C](acetylacetonato)iridium(III), or Ir(ppy)₂(acac), is one of the most studied OLED materials due to its high quantum yields. When doped into 3,5-Diphenyl-4-(1-naphthyl)-1H-1,2,4-triazole (TAZ), very high external quantum efficiencies of (19.06 ± 1.0%) and luminous power efficiencies of 60±5 lm/W were achieved.[1] This was attributed to the nearly 100% internal phosphorescence efficiency of Ir(ppy)₂(acac), coupled with balanced hole and electron injection, and triplet exciton confinement within the light-emitting layer.

Ir(ppy)₂(acac) demonstrated higher external quantum efficiency when compared with Ir(ppy)₃. It was suggested that Ir(ppy)₂(acac) molecules preferentially align so that their transition dipole moment is parallel to the substrate, whereas the orientation of Ir(ppy)₃ molecules is nearly isotropic.[2]

General Information

Product Details

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

Chemical Structure

Device Structure(s)

Device structure	ITO/MO3 (1 nm)/CBP (35 nm)/8 wt% Ir(ppy)2(acac):CBP/TPBi (65 nm)/LiF/Al (100 nm) [3]
Colour	Green
EQE@100 cd/m2	23.4
Current Efficiency@100 cd/m2	81 cd/A
Power Efficiency@100 cd/m2	78.0 lm W−1

Device structure	Cl-ITO*/CBP (35 nm)/CBP:Ir(ppy)2(acac) (15 nm, 8 wt%)/TPBi (65 nm)/LiF (1 nm)/Al (100 nm) [4]
Colour	Green
EQE@100 cd/m2	29.1
Current Efficiency@100 cd/m2	93 cd/A
Power Efficiency@100 cd/m2	97 lm W−1

Device structure	ITO (70 nm)/TAPC (30 nm)/TCTA (10 nm)/TCTA:B3PYMPM:Ir(ppy)2(acac) (30 nm, 1:1: 8 wt%)/B3PYMPM (40 nm)/ LiF (0.7 nm)/ Al (100 nm) [6]
Colour	Green
Turn on Voltage	2.4 V
EQE@100 cd/m2	29.1
Power Efficiency@100 cd/m2	124.0 lm W−1

Device structure	ITO/PEDOT:PSS/α-NPD (20 nm)/TCTA (5 nm)/T2T*:(PPy)2Ir(acac)(9:1 wt%) (25 nm)/TAZ (50 nm)/LiF (0.5 nm)/Al (100 nm) [7]
Colour	Green
Max. Luminance	85,000 cd/m2
Max. Current Efficiency	54 cd/A
Max. EQE	17.4%
Max. Power Efficiency	48 lm W−1

Device structure	ITO/PEDOT:PSS (40 nm)/NPB (15 nm)/ TCTA: 4 wt.% Ir(piq)3 (3.5 nm)/TCTA: 4 wt.% Ir(bt)2(acac) (4 nm)/TCTA: 25 wt.% TmPyPb*: 2 wt. % 4P-NPD* (7 nm)/TmPyPb (4 nm)/TmPyPb: 5 wt.% Ir(ppy)2(acac) (3 nm)/TmPyPb (15 nm)/TmPyPb: 4 wt.% Cs2CO3 (35 nm)/ Cs2CO3/Al [8]
Colour	White
EQE@1000 cd/m2	14.2%
Current Efficiency@1000 cd/m2	26 cd/A
Power Efficiency@1000 cd/m2	21.9 lm W−1

Device structure	ITO/MoO3(1nm)/CBP(20nm)/CBP: Ir(piq)2(acac) (3 wt.%,4 nm)/CBP: Ir(DMP)3(5 wt.%,4 nm)/CBP: Ir(ppy)2(acac)(7 wt.%,5 nm)/CBP(3 nm)/Bepp2:BCzVBi(50wt.%,40nm)/Bepp2(20nm)/LiF(1nm)/Al(100nm) [9]
Colour	White
Max. Current Efficiency	26.4 cd/A
Max. Power Efficiency	24.8 lm W−1

Device structure	Glass/PEDOT:PSS (100 nm)/TAPC (30 nm)/CBP:8 wt% Ir(ppy)2(acac) (20 nm)/B3PYMPM (25 nm)/B3PYMPM:Rb2CO3 (45 nm)/Al(150 nm) [10] ITO FREE
Colour	Green
Max. EQE	64.5%
Max. Power Efficiency	283.4 lm W−1

Device structure	ITO/PEDOT:PSS/TCTA (25 nm)//TCTA:8 wt% Ir(ppy)2(acac) (10 nm)/TPBi (150 nm)/LiF (10 nm)/Al (150 nm) [11]
Colour	Green
Max. EQE	23.7%
Max. Current Efficiency	88 cd/A
Max. Power Efficiency	67.5 lm W−1

*For chemical structure information please refer to the cited references.

Characterisation

Pricing

MSDS Documentation

Ir(ppy)2(acac) MSDS sheet

Literature and Reviews

1. Nearly 100% internal phosphorescence efficiency in an organic light-emitting device, C. Adachi et al., J. Appl. Phys. 90, 5048 (2001); http://dx.doi.org/10.1063/1.1409582.
2. Comparing the emissive dipole orientation of two similar phosphorescent green emitter molecules in highly efficient organic light-emitting diodes, P. Liehm et al., Appl. Phys. Lett. 101, 253304 (2012); http://dx.doi.org/10.1063/1.4773188.
3. Highly simplified phosphorescent organic light emitting diode with >20% external quantum efficiency at >10,000cd/m2, Z. B. Wang et al., Appl. Phys. Lett. 98, 073310 (2011); doi: 10.1063/1.3532844 .