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P‐77: High Efficiency Polymer‐Based Electrophosphorescent Organic Light‐Emitting Diode
Author(s) -
Xie Zhiliang,
Qiu Chengfeng,
Chen Haiying,
Tang Benzhong,
Wong Man,
Kwok HoiSing
Publication year - 2003
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1889/1.1832325
Subject(s) - phosphorescence , iridium , oled , materials science , quantum efficiency , dopant , optoelectronics , doping , phosphorescent organic light emitting diode , diode , layer (electronics) , luminous efficacy , electrical efficiency , electroluminescence , energy conversion efficiency , polymer , photochemistry , fluorescence , optics , chemistry , nanotechnology , power (physics) , composite material , physics , organic chemistry , catalysis , quantum mechanics
We investigate the characteristics of an organic light‐emitting diode with phosphorescent polymer. Two types of double layer diodes based on poly(9‐vinylcarbazole) (PVK) doped with phosphorescent fac tris(2‐phenylpyridine) iridium (III) [Ir(ppy) 3 ]/aluminum (III) bis(2‐methyl‐8‐quinolinato) 4‐phenylphenolate (BAlq) and [PVK doped Ir(ppy) 3 ]/Alq 3 have been investigated. It is found that BAlq can serve as an electron transport layer as well as a hole blocking layer. At the optimal dopant concentration, a high efficiency OLED can be obtained. At 2wt% Ir(ppy) 3 , an effective external quantum efficiency of 10% photons/electron, a low turn‐on voltage of 6V and a luminance power efficiency of 7.3L/W can be achieved.