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Indolo[3,2,1‐jk]carbazole Embedded Multiple‐Resonance Fluorophors for Narrowband Deep‐blue Electroluminescence with EQE≈34.7 % and CIEy≈0.085
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2021-03-20 , DOI: 10.1002/anie.202017328 Jinbei Wei 1 , Chen Zhang 2 , Dongdong Zhang 2 , Yuewei Zhang 2 , Ziyang Liu 2 , Zhiqiang Li 3 , Gui Yu 1 , Lian Duan 4
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2021-03-20 , DOI: 10.1002/anie.202017328 Jinbei Wei 1 , Chen Zhang 2 , Dongdong Zhang 2 , Yuewei Zhang 2 , Ziyang Liu 2 , Zhiqiang Li 3 , Gui Yu 1 , Lian Duan 4
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Multiple‐resonance (MR) organic emitters bearing small full‐width at half‐maximum (FWHMs) are of general interest in organic light‐emitting diodes. Indolo[3,2,1‐jk]carbazole (ICz) embedded MR‐fluorophors have demonstrated extremely small FWHMs, yet in the violet region with low electroluminescence efficiency. Herein, a strategic implementation of ICz subunits into MR fluorophors is proposed by taking advantage of the synergetic effect of para‐positioned nitrogen atoms to enhance electronic coupling to decrease emitting energy gap. Deep blue emitters peaking at 441 and 447 nm with FWHMs of only 18 and 21 nm are thereof obtained, respectively, accompanied by ≈90 % photo‐luminance quantum yields. With the assistance of a thermally activated delayed fluorescence sensitizer to recycle excitons, the corresponding narrowband electroluminescent devices show unprecedent high maximum external quantum efficiencies of 32.0 % and 34.7 % with CIEy of 0.10 and 0.085, respectively.
中文翻译：
Indolo [3,2,1-jk]咔唑嵌入的多共振荧光剂用于窄带深蓝色电致发光，EQE≈34.7％，CIEy≈0.085
在有机发光二极管中，具有较小的半峰全宽（FWHM）的多谐振（MR）有机发射器是人们普遍关注的问题。吲哚并[3,2,1- JK ]咔唑（ICZ）嵌入MR-荧光团都在低电致发光效率的紫色区域表现出非常小的半值宽度，但。在本文中，战略实施ICZ亚基成MR荧光团拟采取的协同效应优势，对定位的氮原子可增强电子耦合，以减小发射能隙。分别获得了在441和447 nm处达到峰值的深蓝色发射器，其FWHM仅为18和21 nm，并伴随着≈90％的光亮度量子产率。借助于热活化的延迟荧光敏化剂再循环激子，相应的窄带电致发光器件显示出前所未有的高最大外部量子效率，分别为32.0％和34.7％，CIE y分别为0.10和0.085。
更新日期：2021-05-17
中文翻译：
Indolo [3,2,1-jk]咔唑嵌入的多共振荧光剂用于窄带深蓝色电致发光，EQE≈34.7％，CIEy≈0.085
在有机发光二极管中，具有较小的半峰全宽（FWHM）的多谐振（MR）有机发射器是人们普遍关注的问题。吲哚并[3,2,1- JK ]咔唑（ICZ）嵌入MR-荧光团都在低电致发光效率的紫色区域表现出非常小的半值宽度，但。在本文中，战略实施ICZ亚基成MR荧光团拟采取的协同效应优势，对定位的氮原子可增强电子耦合，以减小发射能隙。分别获得了在441和447 nm处达到峰值的深蓝色发射器，其FWHM仅为18和21 nm，并伴随着≈90％的光亮度量子产率。借助于热活化的延迟荧光敏化剂再循环激子，相应的窄带电致发光器件显示出前所未有的高最大外部量子效率，分别为32.0％和34.7％，CIE y分别为0.10和0.085。
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