Carbazole‐endcapped Spiro[fluorene‐9, 9′‐xanthene] with Large Steric Hindrance as Hole‐transporting Host for Heavily‐doped and High Performance OLEDs. Issue 8 (2nd June 2015)

• Record Type: Journal Article
• Authors: Zhao, Xianghua; Wu, Yukun; Shi, Nannan; Li, Xiaoyu; Zhao, Yi; Sun, Mingli; Ding, Dongxue; Xu, Hui; Xie, Linghai
• Is Part Of: Chinese journal of chemistry. Volume 33:Issue 8(2015:Aug.)
• Page Start: 955
• Page End: 960
• Publication Date: 2015-06-02
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1002/cjoc.201500252
• Languages: English
• ISSNs: 1001-604X

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>In this work, we designed and synthesized a novel spirocyclic compound functionalized spiro[fluorene‐9, 9′‐xanthene] with carbazole group (2‐carbazolyl‐spiro[fluorene‐9, 9′‐xanthene], <bold>SFX‐Cz</bold>) via Friedel‐Crafts and Ullmann reaction, which is expected to own high thermal and morphological stability, and good carrier injection/transporting properties due to the excellent hole transporting characteristics of carbazole and cruciform structure of spiro[fluorene‐9, 9′‐xanthene]. The carbazole end‐capped spiro[fluorene‐9, 9′‐xanthene] <bold>SFX‐Cz</bold> based PhOLEDs with FIrpic as phosphor emitter have been researched by varying dopant concentration, which exhibit the maximum EQEs of 8.9%, 7.4%, 9.1%, and 4.7% with the doping increasing from 10% to 50%. The higher performance PhOLEDs are independent on concentration variation from 10% to 30%, which suggests the bulky steric hindrance of <bold>SFX‐Cz</bold> might be a potential canditate for high performance and inexpensive device with simplified process.</p> </abstract>