Recent advances in purely organic phosphorescent materials

Abstract

Luminescent organic materials have attracted significant attention in recent times owing to their opportunities in various functional applications. Interestingly, unlike fluorescence, opportunities hidden within the phosphorescence properties of organic compounds have received considerably less attention even until last few years. It is only in the second decade of the 21st century, within a time span of less than last 5 years, that the concepts and prospects of organic compounds as phosphorescent materials have evolved rapidly. The previously perceived limitations of organic compounds as phosphorescent materials have been overcome and several molecules have been designed using old and new concepts, such as heavy atom effects, matrix assisted isolation, hydrogen bonding and halogen bonding, thereby gaining access to a significant number of materials with efficient phosphorescent features. In addition, significant improvements have been made in the development of RTP (room temperature phosphorescent) materials, which can be used under ambient conditions. In this review, we bring together the vastly different approaches developed by various researchers to understand and appreciate this recent revolution in organic luminescent materials.

Exploring the structural changes on excitation of a luminescent organic bromine-substituted complex by in-house time-resolved pump-probe diffraction

“…As described in the introduction to our paper, it has now been shown that organic solids with unusually short Br···Br interactions with phosphorescence lifetimes of milliseconds can be synthesized (Mukherjee and Thilagar, 2015; An et al , 2015; Gong et al , 2015; and Shi et al , 2016). Many of such compounds are described in the literature but have not been examined spectroscopically.…”

“…But more recently organic luminescent solids have received widespread attention; it has been shown that careful molecular design can be used to synthesize organic solids with phosphorescence lifetimes of milliseconds and longer (Mukherjee and Thilagar, 2015; An et al , 2015, Gong et al , 2015; and Shi et al , 2016). The solids are typically based on Br containing molecules with short Br···Br interactions.…”

Progress of Research on Organic/Organometallic Mechanoluminescent Materials

“…化 学发光是指当 A 和 B 两种物质发生化学反应生成 C 物 质的同时释放出化学能, 该化学能被分子 C 或反应中间 态分子的电子吸收, 电子被激发到激发态, 并以发射光 子的形式释放出光能回到基态(图 1c) [35] . 相比以上三种 发光, 电致发光现象最晚被发现, 其原理是: 在外加电 场作用下, 电子和空穴分别从阴极和阳极向夹在电极之 间的有机功能薄膜层注进, 注进的电子和空穴在发光层 复合产生激子, 激子以辐射跃迁方式回到基态发出光的 过程(图 1d) [36] .…”

Thienyl Difluoroboron β-Diketonates in Solution and Polylactide Media

“…1–3 Boron β–diketonates have the unique property of having strong emission in both solution and the solid state. 4,5 In solution, BF 2 bdks display large molar extinction coefficients, 6,7 two-photon cross-sections, 8,9 and high quantum efficiencies.…”