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Highly Efficient Yellow Organic Light Emitting Diode with a Novel Wet‐ and Dry‐Process Feasible Iridium Complex Emitter
Author(s) -
Jou JwoHuei,
Lin YouXing,
Peng ShiangHau,
Li ChiehJu,
Yang YuMin,
Chin ChihLung,
Shyue JingJong,
Sun ShihSheng,
Lee Mandy,
Chen ChienTien,
Liu MingChung,
Chen ChengChang,
Chen GuanYu,
Wu JinHan,
Li ChengHung,
Sung ChaoFeng,
Lee MeiJu,
Hu JePing
Publication year - 2014
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201302013
Subject(s) - iridium , materials science , oled , quantum efficiency , common emitter , quantum yield , chemical vapor deposition , optoelectronics , diode , fabrication , quenching (fluorescence) , nanotechnology , fluorescence , optics , chemistry , organic chemistry , catalysis , medicine , physics , alternative medicine , layer (electronics) , pathology
Yellow emission is crucial in RGBY display technology and in fabricating physiologically friendly, low color‐temperature lighting sources. Emitters with both wet‐ and dry‐process feasibility are highly desirable to fabricate, respectively, high‐quality devices via vapor deposition and cost‐effective, large‐area devices via roll‐to‐roll fabrication. Here, high‐efficiency organic light‐emitting diodes with a novel wet‐ and dry‐process feasible yellow‐emitting iridium complex, bis[5‐methyl‐7‐fluoro‐5H‐benzo(c)(1,5) naphthyridin‐6‐one]iridium (picolinate), are demonstrated. By spin coating, the device shows, at 1000 cd m −2 , an external quantum efficiency (EQE) of 18.5% with an efficacy of 52.3 lm W −1 , the highest among all reported yellow devices via wet‐process, while using vapor deposition, the EQE is 22.6% with a 75.1 lm W −1 efficacy, the highest among all dry‐processed counterparts. The high efficiency may be attributed to the replacement of the hydrogen atom with a fluorine atom on a 2‐substitutional site in the emitter to prevent dense molecular packing‐caused self‐quenching and to reduce radiationless deactivation rates, leading to a high quantum yield (71%).