Efficient triplet exciton confinement of white organic light-emitting diodes using a heavily doped phosphorescent blue emitter
| Autor: | Hoe Min Kim, Ji Hoon Seo, Seung Soo Yoon, Seok Jae Lee, Jun Ho Kim, Young Kwan Kim, Kum Hee Lee |
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| Rok vydání: | 2010 |
| Předmět: |
Materials science
business.industry Metals and Alloys chemistry.chemical_element Surfaces and Interfaces Triphenylamine Surfaces Coatings and Films Electronic Optical and Magnetic Materials law.invention chemistry.chemical_compound chemistry law Materials Chemistry OLED Optoelectronics Quantum efficiency Iridium Luminous efficacy Phosphorescence business Common emitter Light-emitting diode |
| Zdroj: | Thin Solid Films. 518:6184-6187 |
| ISSN: | 0040-6090 |
| DOI: | 10.1016/j.tsf.2010.04.049 |
| Popis: | We demonstrated efficient white electrophosphorescence with a heavily doped phosphorescent blue emitter and a triplet exciton blocking layer (TEBL) inserted between the hole transporting layer (HTL) and the emitting layer (EML). We fabricated white organic light-emitting diodes (WOLEDs) (devices A, B, C, and D) using a phosphorescent red emitter; bis(2-phenylquinolinato)-acetylacetonate iridium III (Ir(pq) 2 acac) doped in the host material; N,N′-dicarbazolyl-3,5-benzene (mCP) as the red EML and the phosphorescent blue emitter; bis(3,5-Difluoro-2-(2-pyridyl)phenyl-(2-carboxypyridyl) iridium III (FIrpic) doped in the host material; p-bis(triphenylsilyly)benzene (UGH2) as the blue EML. The properties of device B, which demonstrate a maximum luminous efficiency and external quantum efficiency of 26.83 cd/A and 14.0%, respectively, were found to be superior to the other WOLED devices. It also showed white emission with CIE x , y coordinates of ( x = 0.35, y = 0.35) at 8 V. Device D, which has a layer of P-type 4,4′,4″-tri(N-carbazolyl)triphenylamine (TCTA) material between the HTL and TEBL, was compared with device A to determine the 430 nm emission peak. |
| Databáze: | OpenAIRE |
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