Blue Thermally Activated Delayed Fluorescence Molecule Having Acridane and Cyanobenzene Units
作者:Hiroki Noda、Ryota Kabe、Chihaya Adachi
DOI:10.1246/cl.160814
日期:2016.12.5
Highly efficient blue thermally activated delayed fluorescence (TADF) materials consisting of 9,9-diphenylacridan and benzonitrile units were developed. We found that placing 9,9-diphenylacridan in the ortho-position of benzonitrile enhanced the TADF process compared with results from meta- and para-substituted derivatives. We observed blue TADF emission with a high photoluminescence quantum yield (80%) and a high reverse intersystem crossing rate constant (1.2 × 106 s−1) for 2,6-bis(9,9-diphenylacridan-10(9H)-yl)benzonitrile (o-A2CN). An organic light-emitting diode fabricated using o-A2CN as an emitter showed good blue emission (CIEx, CIEy = 0.16, 0.16) with high external electroluminescence quantum efficiency (15.9%).
开发了由9,9-二苯基氨基苯和苯腈单元组成的高效蓝色热激活延迟荧光(TADF)材料。我们发现,将9,9-二苯基氨基苯放置在苯腈的邻位,相较于元位和对位取代衍生物,提高了TADF过程。我们观察到2,6-双(9,9-二苯基氨基苯-10(9H)-基)苯腈(o-A2CN)具有高光致荧光量子产率(80%)和高反向跨系统交叉速率常数(1.2 × 10^6 s−1)的蓝色TADF发光。以o-A2CN作为发射体制造的有机发光二极管显示出优良的蓝色发光(CIEx, CIEy = 0.16, 0.16),并且具有高外部电致发光量子效率(15.9%)。