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