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

CAS number	337526-85-9
Chemical formula	C27H23IrN2O2
Molecular weight	599.70 g/mol
Absorption	λmax 259 in THF
Fluorescence	λem 314 in THF
HOMO/LUMO	HOMO 5.6 eV, LUMO 3.0 eV [1]
Synonyms	(ppy)2Ir(acac) Bis[2-(2-pyridinyl-N)phenyl-C](acetylacetonato)iridium(III) Bis[2-(2-pyridinyl-N)phenyl-C](2,4-pentanedionato-O2,O4)iridium(III)
Classification / Family	Organometallic complex, Green emitter, phosphorescence dopant OLEDs, OLED and PLED materials, Sublimed materials

Product Details

Purity	>99.5% (sublimed) >98.0% (unsublimed)
Melting point	349-356 °C
Appearance	Yellow 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.

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

Grade	Order Code	Quantity	Price
Sublimed (>99.5% purity)	M661	100 mg	£159.00
Unsublimed (>98.0% purity)	M662	250 mg	£151.00
Sublimed (>99.5% purity)	M661	250 mg	£265.00
Unsublimed (>98.0% purity)	M662	500 mg	£263.00

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 .
4. Chlorinated Indium Tin Oxide Electrodes with High Work Function for Organic Device Compatibility,M. G. Helander et al., Science, 332, 944-947 (2011); DOI: 10.1126/science.1202992.
5. Low Roll-Off and High Efficiency Orange Organic Light Emitting Diodes with Controlled Co-Doping of Green and Red Phosphorescent Dopants in an Exciplex Forming CoHost, S. Lee et al., Adv. Funct. Mater., 23, 4105–4110 (2013); DOI: 10.1002/adfm.201300187.
6. Exciplex-Forming Co-host for Organic Light-Emitting Diodes with Ultimate Efficiency, Y-S. Park et al., Adv. Funct. Mater., 23, 4914–4920 (2013); DOI: 10.1002/adfm.201300547.
7. 1,3,5-Triazine derivatives as new electron transport–type host materials for highly efficient green phosphorescent OLEDs,H-Fan Chen et al., J. Mater. Chem., 19, 8112–8118 (2009). 
8. A white organic light-emitting diode with ultra-high color rendering index, high efficiency, and extremely low efficiency roll-off, N. Sun et al., Appl. Phys. Lett. 105, 013303 (2014); http://dx.doi.org/10.1063/1.4890217.
9. A multi-zoned white organic light-emitting diode with high CRI and low color temperature,  T. Zhang et al., Sci. Reports, 6:20517; DOI: 10.1038/srep20517.
10. Achieving Above 60% External Quantum Effi ciency in Organic Light-Emitting Devices Using ITO-Free Low-Index Transparent Electrode and Emitters with Preferential Horizontal Emitting Dipoles, C-Y. Lu et al., Adv. Funct. Mater. 2016; DOI: 10.1002/adfm.201505312.
11. High-Efficiency Green Phosphorescent Organic Light-Emitting Diode Based on Simplified Device Structures, M. Zhang et al., Chin. Phys. Lett., 32, 097803 (2015).

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To the best of our knowledge the technical information provided here is accurate. However, Ossila assume no liability for the accuracy of this information. The values provided here are typical at the time of manufacture and may vary over time and from batch to batch.

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