通过拓展D-π-A结构中的π桥实现高效紫蓝光有机发光器件(CIEy=0.046)  

Achieving Efficient Violet-blue Organic Light Emitting Devices(CIEy=0.046)by Extendingπ-conjugation in D-π-A Structure

作　　者：崔江峰 孙静[1,2] 王国良 王智恒 杨晓东 许慧侠 苗艳勤[1,2] 王龙[1] 于军胜 王华 CUI Jiang-feng;SUN Jing;WANG Guo-liang;WANG Zhi-heng;YANG Xiao-dong;XU Hui-xia;MIAO Yan-qin;WANG Long;YU Jun-sheng;WANG Hua(Key Laboratory of Interface Science and Engineering in Advanced Materials,Ministry of Education,Taiyuan University of Technology,Taiyuan 030024,China;Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering,Taiyuan 030024,China;State Key Laboratory of Electronic Thin Films and Integrated Devices,School of Optoelectronic Information,University of Electronic Science and Technology of China,Chengdu 610054,China)

机构地区：[1]太原理工大学新材料界面科学与工程教育部重点实验室,山西太原030024 [2]山西-浙大先进材料与化学工程研究所,山西太原030024 [3]电子科技大学光电信息学院电子薄膜与集成器件国家重点实验室,四川成都610054

出　　处：《发光学报》2022年第7期1102-1113,共12页Chinese Journal of Luminescence

基　　金：国家自然科学基金(62074109,6207031407);山西省自然科学基金(201901D211090,201901D111108);国家自然科学基金联合基金(U21A20492);山西省留学基金项目(2020-049)资助。

摘　　要：紫蓝光有机发光材料在全彩显示和照明领域具有广阔的应用前景。但是该类材料需要宽能隙,因此开发高效的紫蓝色材料是一项巨大的挑战。本文利用10H-吩噻嗪5,5-二氧化物(2OPTZ)作为弱受体、N-苯基-2-萘胺(PNA)作为供体,设计合成了两个具有D-π-A型结构的紫蓝色材料,命名为2OPTZ-PNA和2OPTZ-BPPNA。通过延长给受体之间的π共轭长度,使局域态和电荷转移态被优化,并且薄膜中的绝对量子产率从14%提高到33%。此外,利用2OPTZ-BP-PNA制备的非掺杂器件呈现紫蓝光(436 nm)发射,半峰全宽为54 nm,色坐标为(0.155,0.046),外量子效率为4.1%。鉴于此,本文提供了一种制备高质量紫蓝发光材料的有效策略。Organic violet-blue luminescent materials have exhibited great potential in full-color displaying and lighting fields.However,it is a huge challenge to develop efficient violet-blue emitters because of the inherently wide energy gap.In this work,two violet-blue emitters with donor(D)-π-acceptor(A)type using 10H-phenothiazine 5,5-dioxide(2OPTZ)as a weak acceptor and N-(2-naphthyl)aniline(PNA)as the donor,namely 2OPTZ-PNA and 2OPTZ-BPPNA,were designed and synthesized.By extendingπ-conjugation length between donor and acceptor,local excited states and charge transfer excited states were adjusted,and absolute photoluminescence quantum yields(PLQYs)values in the evaporated film increased from 14% to 33%.Notably,non-doped device based 2OPTZ-BP-PNA exhibits violetblue light at 436 nm with a narrow full width at half-maximum(FWHM)of 54 nm,Commission Internationale de l’Eclairage(CIE)coordinates of(0.155,0.046)and external quantum efficiency(EQE)of 4.1%.Given this,our results provide an efficient design strategy for the high-quality violet-blue luminescent materials.

关 键 词：有机发光二极管 紫蓝色 二氧化吩噻嗪 D-π-A结构 π共轭长度 

分 类 号：TN312.8[电子电信—物理电子学]