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Lifetime-Extending 3-(4-Phenylbenzo[4,5]thieno[3,2-d]pyrimidin-2-yl)benzonitrile Acceptor for Thermally Activated Delayed Fluorescence Emitters
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2021-01-06 , DOI: 10.1021/acsami.0c17819
Ha Lim Lee 1 , Chan Seok Oh 1 , Kyung Hyung Lee 1 , Jun Yeob Lee 1 , Wan Pyo Hong 2
Affiliation  

Highly efficient and long-living green thermally activated delayed fluorescence (TADF) organic light-emitting diodes (OLEDs) were developed using benzothienopyrimidine-4-benzonitrile acceptor-derived compounds as the TADF emitters. A molecular design merging the benzothienopyrimidine-4-benzonitrile acceptor with either indolocarbazole or diindolocarbazole was employed to prepare two TADF emitters, 5-(2-phenylbenzo[4,5]thieno[3,2-d]pyrimidin-4-yl)-2-(5-phenylindolo[3,2-a]carbazol-12(5H)-yl)benzonitrile and 2-(10,15-diphenyl-10,15-dihydro-5H-diindolo[3,2-a:3′,2′-c]carbazol-5-yl)-5-(2-phenylbenzo[4,5]thieno[3,2-d]pyrimidin-4-yl)benzonitrile (BTPDIDCz), as the green and greenish-yellow emitters. Among the two emitters, BTPDIDCz with the diindolocarbazole donor combined with the benzothienopyrimidine-4-benzonitrile acceptor demonstrated a high external quantum efficiency of 24.5% and 3 times longer device lifetime than the state-of-the-art green emitter. This work proposed the potential of benzothienopyrimidine-4-benzonitrile as the acceptor for long lifetime in TADF emitters.

中文翻译:

延长寿命的3-(4-苯基苯并[4,5]噻吩并[3,2 - d ]嘧啶-2-基)苄腈受体,用于热活化延迟荧光发射体

使用苯并噻吩并嘧啶-4-苄腈受体衍生的化合物作为TADF发射体,开发了高效且长寿命的绿色热激活延迟荧光(TADF)有机发光二极管(OLED)。将苯并噻吩并嘧啶-4-苯甲腈受体与吲哚并咔唑或二吲哚并咔唑合并的分子设计用于制备两个TADF发射体5-(2-苯基苯并[4,5]噻吩并[3,2 - d ]嘧啶-4-基)- 2-(5-苯基吲哚[3,2- a ]咔唑-12(5 H)-基)苄腈和2-(10,15-二苯基-10,15-二氢-5 H -diindolo [3,2- a:3',2'- c ]咔唑-5-基)-5-(2-苯基苯并[4,5]噻吩并[3,2- d] pyrimidin-4-yl)苄腈(BTPDIDCz),为绿色和绿色的黄色发光体。在这两个发射器中,具有双吲哚并咔唑供体与苯并噻吩并嘧啶-4-苄腈受体结合的BTPDIDCz表现出24.5%的高外部量子效率,并且器件寿命比最新的绿色发射器长3倍。这项工作提出了苯并噻吩并嘧啶-4-苄腈作为TADF发射体中长寿命受体的潜力。
更新日期:2021-01-20
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