13 September 2012 High-efficiency green electrophosphorescent organic light-emitting diodes with a simple device structure
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Proceedings Volume 8476, Organic Light Emitting Materials and Devices XVI; 84761X (2012); doi: 10.1117/12.929566
Event: SPIE Organic Photonics + Electronics, 2012, San Diego, California, United States
Abstract
In this study, we demonstrate electrophosphorescent organic light-emitting diodes (PHOLEDs) with a simple structure and high efficiency, utilizing fac-tris(2-phenylpyridine)iridium(III) (Ir(ppy)3) as a green phosphorescent emitter. The device structure (ITO/TAPC/TAPC:Ir(ppy)3/TPBi:Ir(ppy)3/TPBi /LiF/Al) was fabricated by the hole transporting layer of 1,1-bis((di-4-tolylamino)phenyl)cyclohexane (TAPC; T1 = 2.87 eV) and the electron transporting layer of 2,2,2-(1,3,5-benzenetriyl)tris-[1-phenyl-1H-benzimidazole] (TPBI; T1 = 2.74 eV) to assemble a double emitting zone without common host materials. The emitting region with a TAPC/TPBI bilayer interface was able to provide an effective energy transference of Ir(ppy)3 (T1 = 2.4 eV). Thus, the green PHOLED exhibited high current efficiency (70 cd/A at 100 cd/m2) and low roll-off in these devices.
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Chih-Hsien Yuan, Shun-Wei Liu, Li-An Liu, Yu-San Chen, Pao-Chen Lai, Chih-Chien Lee, "High-efficiency green electrophosphorescent organic light-emitting diodes with a simple device structure", Proc. SPIE 8476, Organic Light Emitting Materials and Devices XVI, 84761X (13 September 2012); doi: 10.1117/12.929566; https://doi.org/10.1117/12.929566
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KEYWORDS
Phosphorescent organic light-emitting diodes

Organic light emitting diodes

Excitons

Electroluminescence

Electron transport

Interfaces

Doping

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