三苯甲基和三苯硅基螺双芴主体的比较：合成、光物理性质及在磷光有机发光二极管中的性能。

A Comparison between Triphenylmethyl and Triphenylsilyl Spirobifluorenyl Hosts: Synthesis, Photophysics and Performance in Phosphorescent Organic Light-Emitting Diodes.

机构信息

Department of Chemistry, University of Southern California, Los Angeles, CA 90089, USA.

Mork Family Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, CA 90089, USA.

出版信息

Molecules. 2023 Jul 6;28(13):5241. doi: 10.3390/molecules28135241.

DOI:10.3390/molecules28135241

PMID:37446902

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10343340/

Abstract

This study presents the synthesis and characterization of two spirobifluorenyl derivatives substituted with either triphenylmethyl () or triphenylsilyl () moieties for use as host materials in phosphorescent organic light-emitting diodes (PHOLED). Both molecules have similar high triplet energies and large energy gaps. Blue Ir(tpz) and green Ir(ppy) phosphorescent devices were fabricated using these materials as hosts. Surprisingly, demonstrated superior charge-transporting ability compared to , despite having similar energies for their valence orbitals. In particular, proved to be a highly effective host for both blue and green devices, resulting in maximum efficiencies of 12.6% for the Ir(tpz) device and 9.6% for the Ir(ppy) device. These results highlight the benefits of appending the triphenylsilyl moiety onto host materials and underscore the importance of considering the morphology of hosts in the design of efficient PHOLEDs.

摘要

本研究合成并表征了两种螺双芴基衍生物，它们分别用三苯甲基（）或三苯硅基（）取代，用作磷光有机发光二极管（PHOLED）中的主体材料。这两个分子具有相似的高三重态能量和大能隙。使用这些材料作为主体，制备了蓝色 Ir(tpz) 和绿色 Ir(ppy) 磷光器件。令人惊讶的是，尽管它们的价轨道能量相似，但表现出比更好的电荷传输能力。特别是，被证明是蓝色和绿色器件的高效主体，使 Ir(tpz) 器件的最大效率达到 12.6%，Ir(ppy) 器件的最大效率达到 9.6%。这些结果突出了在主体材料上附加三苯硅基的好处，并强调了在设计高效 PHOLED 时考虑主体形态的重要性。