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).

---

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.

About Ossila Founded in 2009 by organic electronics research scientists, Ossila aims to provide the components, equipment, and materials to enable intelligent and efficient scientific research and discovery. Over a decade on, we're proud to supply our products to over 1000 different institutions in over 80 countries globally. With decades of academic and industrial experience in developing organic and thin-film LEDs, photovoltaics, and FETs, we know how long it takes to establish a reliable and efficient device fabrication and testing process. As such, we have developed coherent packages of products and services - enabling researchers to jump-start their organic electronics development program. The Ossila Guarantee Free Worldwide Shipping Eligible orders ship free to anywhere in the world Fast Secure Dispatch Rapid dispatch on in-stock items via secure tracked courier services Quality Assured Backed up by our free two year warranty on all equipment Clear Upfront Pricing Clear pricing in over 30 currencies with no hidden costs Large Order Discounts Save 8% on orders over $10,300.00 and 10% on orders over $12,900.00 Expert Support Our in-house scientists and engineers are always ready to help Trusted Worldwide Great products and service. Have already recommended to many people. Dr. Gregory Welch, University of Calgary Wonderful company with reasonably priced products and so customer-friendly! Shahriar Anwar, Arizona State University The Ossila Team Prof. David Lidzey - Chairman As professor of physics at the University of Sheffield, Prof. David Lidzey heads the university’s Electronic and Photonic Molecular Materials research group (EPMM). During his career, David has worked in both academic and technical environments, with his main areas of research including hybrid organic-inorganic semiconductor materials and devices, organic photonic devices and structures and solution processed photovoltaic devices. Throughout his academic career, he has authored over 220 peer-reviewed papers. Dr. James Kingsley - Managing Director James is a co-founder and managing director of Ossila. With a PhD in quantum mechanics/nanotech and over 12 years’ experience in organic electronics, his work on the fabrication throughput of organic photovoltaics led to the formation of Ossila and the establishment of a strong guiding ethos: to speed up the pace of scientific discovery. James is particularly interested in developing innovative equipment and improving the accessibility of new materials for solution-processable photovoltaics and hybrid organic-inorganic devices. Dr. Alastair Buckley - Technical Director Alastair is a lecturer of Physics at the University of Sheffield, specialising in organic electronics and photonics. He is also a member of the EPMM research group with a focus on understanding and applying the intrinsic advantages of functional organic materials to a range of optoelectronic devices. Alastair’s experience has not been gained solely in academia; he previously led the R&D team at MicroEmissive Displays and therefore has extensive technical experience in OLED displays. He is also the editor and contributor of "Organic Light-Emitting Diodes" by Elsevier. Our Research Scientists Our research scientists and product developers have significant experience in the synthesis and processing of materials and the fabrication and testing of devices. The vision behind Ossila is to share this experience with academic and industrial researchers alike, and to make their research more efficient. By providing products and services that take the hard work out of the device fabrication process, and the equipment to enable accurate, rapid testing, we can free scientists to focus on what they do best - science. Customer Care Team The customer care team is responsible for the customer journey at Ossila. From creating and providing quotes, through to procurement and inventory management, the customer care team is devoted to providing first class customer service. The general day to day responsibilities of a customer care team member involves processing customers orders and price queries, answering customer enquiries, arranging the shipment of parcels and notifying customers of updates on their orders. Collaborations and Partnerships Please contact the customer care team for all enquires, including technical questions about Ossila products or for advice on fabrication and measurement processes. Location and Facilities Ossila is based at the Solpro Business Park in Attercliffe, Sheffield. We operate a purpose-built synthetic chemistry and device testing laboratory on site, where all of our high-purity, batch-specific polymers and other formulations are made. This is complemented by a dedicated suite of thin-film and organic electronics testing and analysis tools within the device fabrication cluster housed in a class 1000 cleanroom in the EPSRC National Epitaxy Facility in Sheffield. All our electronic equipment is manufactured on-site.