Enhanced deep-red emission in donor-acceptor molecular architecture: The role of ancillary acceptor of cyanophenyl
Enhanced deep-red emission in donor-acceptor molecular architecture: The role of ancillary acceptor of cyanophenyl
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供体-受体分子结构中增强的深红色发射：氰基苯基辅助受体的作用
DOI：
10.1016/j.cclet.2019.07.059
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发表时间：
2019-11-01
影响因子：
9.1
通讯作者：
Ma, Yuguang
中科院分区：
文献类型：
--
作者：
Shen, Yue;Tang, Xiaohui;Ma, Yuguang
近年来，具有高效率深红色发光的有机固体发光材料引起了人们极大的兴趣。构建供体-受体（D-A）型分子是实现深红色发光的最常用策略之一，但由于电荷转移态的限制，很难获得较高的光致发光（PL）量子产率（eta（PL））。本文报道了一种新的D-A型分子4-（7-（4-（二苯基氨基）苯基）-9-氧代-9H-芴-2-基）苯甲腈（TPAFOCN），它是由给体-受体-给体（D-A-D）型2，7-双（4-（二苯基氨基）苯基）-9H-芴-9-酮（DTPA-FO）衍生而来，在固体中具有最大荧光强度627 nm。这种分子设计使得受体能够从芴酮（FO）本身转化为4-（9-氧代-9H-芴-2-基）苯甲腈（FOCN）。与DTPA-FO相比，氰基苯基的引入不仅使TPA-FOCN的发射峰向深红色移动，在固体中的荧光最大值为668 nm，而且保持了10%的高eta（PL）。此外，以TPA-FOCN为发光体，制备了溶液处理的非掺杂有机电致发光二极管（OLED）。TPA-FOCN器件的最大发光效率为0.13 cd/A，最大外量子效率（EQE）为0.22%，CIE坐标为（0.64，0.35）。该工作为合理设计以氰基苯基为辅助受体的高效深红色发光材料提供了一种有价值的策略。(C)2019中国化学会、中国医学科学院药物研究所。Elsevier B. V.出版，保留所有权利。
Organic solid-state luminescent materials with high-efficiency deep-red emission have attracted considerable interest in recent years. Constructing donor-acceptor (D-A) type molecules has been one of most commonly used strategies to achieve deep-red emission, but it is always difficult to achieve high photoluminescence (PL) quantum yield (eta(PL)) due to forbidden charge-transfer state. Herein, we report a new D-A type molecule 4-(7-(4-(diphenylamino)phenyl)-9-oxo-9H-fluoren-2-yl)benzonitrile (TPAFOCN), deriving from donor-acceptor-donor (D-A-D) type 2,7-bis(4-(diphenylamino)phenyl)-9H-fluoren-9-one (DTPA-FO) with a fluorescence maximum of 627 nm in solids. This molecular design enables a transformation of acceptor from fluorenone (FO) itself to 4-(9-oxo-9H-fluoren-2-yl) benzonitrile (FOCN). Compared with DTPA-FO, the introduction of cyanophenyl not only shifts the emission of TPA-FOCN to deep red with a fluorescence maximum of 668 nm in solids, but also maintains the high eta(PL) of 10%. Additionally, a solution-processed non-doped organic light-emitting diode (OLED) was fabricated with TPA-FOCN as emitter. TPA-FOCN device showed a maximum luminous efficiency of 0.13 cd/A and a maximum external quantum efficiency (EQE) of 0.22% with CIE coordinates of (0.64, 0.35). This work provides a valuable strategy for the rational design of high-efficiency deep-red emission materials using cyanophenyl as an ancillary ancillary acceptor. (C) 2019 Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences. Published by Elsevier B.V. All rights reserved.