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基于卡宾-金属酰胺的高效真空处理发光二极管。

Efficient Vacuum-Processed Light-Emitting Diodes Based on Carbene-Metal-Amides.

机构信息

Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, CB3 0HE, Cambridge, UK.

School of Chemistry, University of East Anglia, Earlham Road, Norwich, NR4 7TJ, UK.

出版信息

Adv Mater. 2018 Aug;30(35):e1802285. doi: 10.1002/adma.201802285. Epub 2018 Jul 9.

Abstract

Efficient vacuum-processed organic light-emitting diodes are fabricated using a carbene-metal-amide material, CMA1. An electroluminescence (EL) external quantum efficiency of 23% is achieved in a host-free emissive layer comprising pure CMA1. Furthermore external quantum efficiencies of up to 26.9% are achieved in host-guest emissive layers. EL spectra are found to depend on both the emissive-layer doping concentration and the choice of host material, enabling tuning of emission color from mid-green (Commission Internationale de l'Éclairage co-ordinates [0.24, 0.46]) to sky blue ([0.22 0.35]) without changing dopant. This tuning is achieved without compromising luminescence efficiency (>80%) while maintaining a short radiative lifetime of triplets (<1 μs).

摘要

采用卡宾-金属-酰胺材料 CMA1 制备高效率真空处理有机发光二极管。在不含主体的发射层中,纯 CMA1 实现了 23%的电致发光(EL)外量子效率。此外,在主客体发射层中实现了高达 26.9%的外量子效率。EL 光谱发现既取决于发射层掺杂浓度,又取决于主体材料的选择,从而能够在不改变掺杂剂的情况下,将发射颜色从中绿光(国际照明委员会坐标 [0.24, 0.46])调谐到天蓝色([0.22, 0.35])。这种调谐在不牺牲发光效率(>80%)的情况下实现,同时保持短的三重态辐射寿命(<1 μs)。

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