Iridium(III) Phosphors–Bearing Functional 9-Phenyl-7,9-dihydro-8H-purin-8-ylidene Chelates and Blue Hyperphosphorescent OLED Devices

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

View graph of relations

Author(s)

Detail(s)

Original languageEnglish
Article number2100381
Journal / PublicationAdvanced Photonics Research
Volume3
Issue number7
Online published8 Mar 2022
Publication statusPublished - Jul 2022

Link(s)

Abstract

Herein, a series of blue-emitting Ir(III) phosphors is reported based on the cyclometalating N-heterocyclic carbenes (NHCs), in which the typical benzimidazolylidene entity is now replaced by a new 7,9-dihydro-8H-purin-8-ylidene unit. The two extra-nitrogen atoms of benzimidazolylidene entity that are successfully fined turn the emission to the true-blue region. As the proof of concept, both experimental measurement and theoretical calculation of these emitters are conducted, revealing high photoluminescence quantum yields up to 92%, peak maximum located in the region 420–490  nm, and radiative lifetime lower than 1 μs, depending on their stereochemical configuration (i.e., meridional or facial), together with distinctive phenyl cyclometalating appendage. Their photophysical characteristics are among the best of carbene-based Ir(III) blue phosphors. Blue phosphorescent organic light-emitting diode (OLED) using one representative derivative m-2tBu as sole dopant emitter achieves a high external quantum efficiency (EQE) up to 17.0%, and a small efficiency roll-off of 16% at 1000 cd m−2. Furthermore, a true-blue hyperphosphorescent OLED with 25 wt% of m-2tBu as sensitizer and 2 wt% of N7,N7,N13,N13,5,9,11,15-octaphenyl-5,9,11,15-tetrahydro-5,9,11,15-tetraaza-19b,20b-diboradinaphtho[3,2,1-de:1′,2′,3′-jk]pentacene-7,13-diamine (ν-DABNA) as emitter is also fabricated, giving excellent performance with maximum EQE up to 22.0% and Commission Internationale de l’Éclairage (CIE)xy coordinates of (0.120, 0.155).

Research Area(s)

  • blue, carbine, cyclometalate, iridium, organic light emitting diodes, thermally activated delayed fluorescence

Citation Format(s)

Iridium(III) Phosphors–Bearing Functional 9-Phenyl-7,9-dihydro-8H-purin-8-ylidene Chelates and Blue Hyperphosphorescent OLED Devices. / Jin, Jibiao; Zhu, Zelin; Yan, Jie; Zhou, Xiuwen; Cao, Chen; Chou, Pi-Tai; Zhang, Ye-Xin; Zheng, Zhong; Lee, Chun-Sing; Chi, Yun.

In: Advanced Photonics Research, Vol. 3, No. 7, 2100381, 07.2022.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

Download Statistics

No data available