Synthesis of a high-efficiency red phosphorescent emitter for organic light-emitting diodes
作者:Cheng-Hsien Yang、Chia-Cheng Tai、I-Wen Sun
DOI:10.1039/b313843g
日期:——
Four novel red phosphorescent emitter compounds bis(1-phenylisoquinolinato-N,C2′)iridium(acetylacetonate), (piq)2Ir(acac), bis(1-(1′-naphthyl)isoquinolinato-N,C2′)iridium(acetylacetonate), (1-niq)2Ir(acac), bis(1-(2′-naphthyl)isoquinolinato-N,C2′)iridium(acetylacetonate), (2-niq)2Ir(acac) and bis(1-phenyl-5-methylisoquinolinato-N,C2′)iridium(acetylacetonate), (m-piq)2Ir(acac), have been synthesized and fully characterized. Electroluminescent devices with a configuration of ITO/NPB/CBP:dopant/BCP/AlQ3/Al were fabricated. All devices emitted in the red region with an emission ranging from 624 to 680 nm. (m-piq)2Ir(acac) shows a maximum brightness of 17164 cd m−2 at a current density of J
= 300 mA cm−2 and the best luminance efficiency of 8.91 cd A−1 at a current density of J
= 20 mA cm−2. (1-niq)2Ir(acac) exhibits pure-red emission with 1931 CIE (Commission International de L'Eclairage) chromaticity coordinates x
= 0.701, y
= 0.273.
合成了四种新型红色磷光发射体化合物:双(1-苯基异喹啉-N,C2′)铱(乙酰丙酮),(piq)2Ir(acac)、双(1-(1′-萘基)异喹啉-N,C2′)铱(乙酰丙酮),(1-niq)2Ir(acac)、双(1-(2′-萘基)异喹啉-N,C2′)铱(乙酰丙酮),(2-niq)2Ir(acac)和双(1-苯基-5-甲基异喹啉-N,C2′)铱(乙酰丙酮),(m-piq)2Ir(acac),并对其进行了全面表征。制备了结构为ITO/NPB/CBP:掺杂剂/BCP/AlQ3/Al的电致发光器件。所有器件在红色区域发射,发射范围从624到680 nm。(m-piq)2Ir(acac)在电流密度J=300 mA cm−2时显示出最大亮度17164 cd m−2,在电流密度J=20 mA cm−2时显示出最佳亮度效率8.91 cd A−1。(1-niq)2Ir(acac)表现出纯红色发射,1931CIE(国际照明委员会)色度坐标x=0.701,y=0.273。