有机发光二极管
材料科学
分子内力
光电子学
紫外线
窄带
激子
量子效率
电致发光
偶极子
接受者
光学
纳米技术
凝聚态物理
有机化学
立体化学
量子力学
图层(电子)
物理
化学
作者
Kevin J. Chen,Jingli Lou,Haozhong Wu,Juanjuan Luo,Dezhi Yang,Xianfeng Qiao,Han Zhang,Ben Zhong Tang,Zhiming Wang
标识
DOI:10.1002/adom.202301053
摘要
Abstract High‐quality near‐ultraviolet/deep‐blue organic emitters are urgently needed but still rare. Here, three V‐shape donor‐acceptor‐donor (D‐A‐D) emitters based on pyrazine cores, namely, VDMP‐PhCz, VDMP‐36PhCz, and VDMP‐TPA, are designed and synthesized. Their doped devices using a high‐polar host show remarkable electroluminescence (EL) performances with maximum external quantum efficiency (EQE) values up to 7.37%, 7.55%, and 9.03%, and corresponding CIE coordinates of (0.160,0.040), (0.161,0.039), and (0.149,0.072), respectively. Supported by theoretical calculations and experimental results, the high EL performances of these emitters are achieved by their planarized intramolecular charge transfer (PLICT) features, high triplet‐excitons utilization from “hot exciton” channels, and high horizontal dipole orientations. Furthermore, these PLICT‐based emitters can also function as efficient hosts for green or yellow multi‐resonance (MR) narrowband emissive guests, providing high EQEs of over 32% with alleviated efficiency roll‐offs.
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