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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
Received:18 March 2022,
Revised:05 April 2022,
Published:05 July 2022
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崔江峰,孙静,王国良等.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)[J].发光学报,2022,43(07):1102-1113.
CUI Jiang-feng,SUN Jing,WANG Guo-liang,et al.Achieving Efficient Violet-blue Organic Light Emitting Devices (CIEy=0.046) by Extending π-conjugation in D-π-A Structure[J].Chinese Journal of Luminescence,2022,43(07):1102-1113.
崔江峰,孙静,王国良等.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)[J].发光学报,2022,43(07):1102-1113. DOI: 10.37188/CJL.20220093.
CUI Jiang-feng,SUN Jing,WANG Guo-liang,et al.Achieving Efficient Violet-blue Organic Light Emitting Devices (CIEy=0.046) by Extending π-conjugation in D-π-A Structure[J].Chinese Journal of Luminescence,2022,43(07):1102-1113. DOI: 10.37188/CJL.20220093.
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⁃BP⁃PNA。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-BP-PNA, were designed and synthesized. By extending π-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 violet-blue 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.
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