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首页> 外文期刊>Journal of Materials Chemistry, C. materials for optical and electronic devices >Highly efficient deep-red organic electrophosphorescent devices with excellent operational stability using bis(indoloquinoxalinyl) derivatives as the host materials
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Highly efficient deep-red organic electrophosphorescent devices with excellent operational stability using bis(indoloquinoxalinyl) derivatives as the host materials

机译：使用双（吲哚并喹喔啉基）衍生物作为主体材料的高效深红色有机电致发光器件，具有出色的操作稳定性

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摘要

Three new bis(indoloquinoxalinyl) derivatives, BIQF (6,6~'-(4,4~'-(9H-f luorene-9,9-diyl)bis(4,1-phenylene))bis(6Hindolo[2,3-b]quinoxaline)), BIQTP (9,9~'-(1,1~':4~',1~"-terphenyl-4,4~"-diyl)bis(6H-indolot2,3-ib]quinoxaline), and BIQMCz (6,6~'-(9-p-tolyl-9H-carbazole-3,6-diyl)bis(6H-indolo[2,3-b]quinoxaline)) linked by the fiuorenyl, terphenyl and carbazolyl groups, respectively, were synthesized, characterized and used as the hosts for deep-red phosphorescent organic light-emitting diodes (PhOLEDs). The central linkers provide a way to reach higher molecular weights with little change of the energy gap of the molecules relative to the parent indoloquinoxaline molecule. These materials are bipolar and show high glass transition temperatures ~200 °C and triplet energy gaps 2.25-2.37 eV. The electroluminescent (EL) devices based on these host materials and iridium deep-red emitters exhibit very high device efficiency with a EQE_(max) mostly above 20%. For example, the device utilizing (tmq)2lr(acac) as the dopant and BIQMCz as the host shows a maximum current efficiency of 32.4 cd A~(-1) and a maximum power efficiency of 30.9 Im W~(-1). The operational lifetimes (T_(50)) of these devices were also measured. The results show that the BIQMCz/lr(piq)3-based device gave T_(50) of more than 20 000 h at an initial luminance of 500 cd m~(-2) with a current efficiency (CE) of 23.2 cd A~(-1) and Commission Internationale de I'Eclairage (CIE) coordinates of (0.67,0.33).
机译：三个新的双（吲哚并喹喔啉基）衍生物BIQF（6,6〜'-（4,4〜'-（9H-f luorene-9,9-diyl）bis（4,1-phenylene））bis（6Hindolo [2， 3-b]喹喔啉）），BIQTP（9,9〜'-（1,1〜'：4〜'，1〜“-三联-4,4〜”二基）双（6H-吲哚2,3-ib ] quinoxaline）和BIQMCz（6,6〜'-（9-p-tolyl-9H-咔唑-3,6-二基）双（6H-吲哚并[2,3-b] quinoxaline）），分别合成，表征和表征了三联苯基和咔唑基，并将其用作深红色磷光有机发光二极管（PhOLED）的主体，中心连接基团提供了一种在不改变其能隙的情况下达到较高分子量的方法。相对于母体吲哚喹喔啉分子，这些材料是双极性的，显示出高的玻璃化转变温度〜200°C和三重态能隙2.25-2.37 eV。基于这些主体材料和铱深红色发射体的电致发光（EL）器件显示器件效率很高，EQE_（max）大多高于20％。例如，器件利用（t mq）2lr（acac）作为掺杂剂，BIQMCz作为主体显示出32.4 cd A〜（-1）的最大电流效率和30.9 Im W〜（-1）的最大功率效率。还测量了这些设备的使用寿命（T_（50））。结果表明，基于BIQMCz / lr（piq）3的器件在500 cd m〜（-2）的初始亮度下的T_（50）大于20000 h，电流效率（CE）为23.2 cd A 〜（-1）和国际照明委员会（CIE）的坐标为（0.67,0.33）。

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