磷光
材料科学
有机发光二极管
掺杂剂
乙二醇
磷光有机发光二极管
咔唑
光电子学
量子效率
可伸缩电子设备
纳米技术
光化学
化学工程
荧光
兴奋剂
图层(电子)
光学
数码产品
工程类
物理化学
物理
化学
作者
Je-Heon Oh,Jin‐Woo Park
标识
DOI:10.1021/acsami.3c03794
摘要
Intrinsically stretchable organic light-emitting diodes (is-OLEDs) have attracted significant attention for use in next-generation displays. However, most studies conducted to date have focused on how to make fluorescent materials stretchable, utilizing singlet excitons with a theoretical internal quantum efficiency (IQE) of 25%. Although phosphorescent materials have a high theoretical IQE of 100%, no previous work has attempted to develop stretchable phosphorescent light-emitting materials. In this work, we designed a solution-processable and intrinsically stretchable phosphorescent light-emitting layer (isp-EML) by blending various additives together with a mixture of a polymer host, poly(9-vinyl carbazole) (PVK), and a small-molecule emitting dopant, tris(2-phenylpyridine)iridium(III) (Ir(ppy)3). The poly(ethylene glycol)-block-poly(propylene glycol)-block-poly(ethylene glycol) (PEG–PPG–PEG) additive significantly improved the stretchability (∼100% strain), brightness (∼5400 cd/m2), and efficiency (∼25.3 cd/A) of the isp-EML compared with a conventional phosphorescent EML (approximately 3% strain, 3750 cd/m2, and 12.1 cd/A). Furthermore, by changing the emitting dopant in the isp-EML, we could control the red, green, and blue emission colors, with increasing mechanical and electrical properties of the isp-EML. These results highlight the promising potential of the novel blend system using phosphorescent materials and additives for application in highly stretchable and efficient OLEDs.
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