Purinylidene-Based Iridium(III) Phosphors for Efficient Purple Phosphorescence and Organic Light-Emitting Devices

Jie Yan; Yi Pan; Zhi-Hao Qu; Zihan Xu; Kwok-Chung Law; Dong-Ying Zhou; Liang-Sheng Liao; Yun Chi; Kai-Chung Lau

doi:10.1002/adpr.202400151

Purinylidene-Based Iridium(III) Phosphors for Efficient Purple Phosphorescence and Organic Light-Emitting Devices

Jie Yan (Co-first Author)
, Yi Pan (Co-first Author)
, Zhi-Hao Qu
, Zihan Xu
, Kwok-Chung Law
, Dong-Ying Zhou^*
, Liang-Sheng Liao^*
, Yun Chi^*
, Kai-Chung Lau^*

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

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Abstract

It is very challenging to achieve highly efficient and low roll-off purple to deep-blue organic light-emitting diodes (OLEDs) due to the limited selection of suitable emitters. Herein, a series of Ir(III) phosphors-bearing purinylidene-based N-heterocyclic carbene (NHC) chelates are reported, namely, f-ct2a-d, which have successfully turned the emission peak maxima to the purple region (427-432 nm) in degassed toluene, together with high quantum yields of 77%-81%. Notably, f-ct2b is further employed as the phosphorescent dopant in the fabrication of OLEDs to afford deep-blue emission paking at 448 nm and an EQE of 6.7% at 100 cd m^-2. Furthermore, a true-blue hyperphosphorescent OLED with 21 wt% of f-ct2a as sensitizer and 1 wt% of ν-DABNA as terminal emitter is also fabricated, giving excellent performance with max. EQE up to 22.2% and an EQE of 19.2% at a brightness of 100 cd m^-2. © 2024 The Author(s).

Original language	English
Article number	2400151
Journal	Advanced Photonics Research
Volume	6
Issue number	5
Online published	11 Nov 2024
DOIs	https://doi.org/10.1002/adpr.202400151
Publication status	Published - May 2025

Funding

J.Y. and Y.P. contributed equally to this work. Financial support of this work was provided by the University Grants Council (CityU 11304221, CityU 11312722, and CityU 11305224) and City University of Hong Kong, Hong Kong SAR for YC, and National Natural Science Foundation of China (nos. 62175171 and 62375193) for DYZ and LSL. The computational studies were carried out using the High-Performance Computing facility, CityU Burgundy at City University of Hong Kong. Open Access made possible with partial support from the Open Access Publishing Fund of the City University of Hong Kong.

Research Keywords

carbene
cyclometalate
iridium
near ultraviolet
organic light-emitting diodes
purple

Publisher's Copyright Statement

This full text is made available under CC-BY 4.0. https://creativecommons.org/licenses/by/4.0/

RGC Funding Information

RGC-funded

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@article{50bf76c1ec0f46c4aa86107ade1f8f6a,

title = "Purinylidene-Based Iridium(III) Phosphors for Efficient Purple Phosphorescence and Organic Light-Emitting Devices",

abstract = "It is very challenging to achieve highly efficient and low roll-off purple to deep-blue organic light-emitting diodes (OLEDs) due to the limited selection of suitable emitters. Herein, a series of Ir(III) phosphors-bearing purinylidene-based N-heterocyclic carbene (NHC) chelates are reported, namely, f-ct2a-d, which have successfully turned the emission peak maxima to the purple region (427-432 nm) in degassed toluene, together with high quantum yields of 77\%-81\%. Notably, f-ct2b is further employed as the phosphorescent dopant in the fabrication of OLEDs to afford deep-blue emission paking at 448 nm and an EQE of 6.7\% at 100 cd m-2. Furthermore, a true-blue hyperphosphorescent OLED with 21 wt\% of f-ct2a as sensitizer and 1 wt\% of ν-DABNA as terminal emitter is also fabricated, giving excellent performance with max. EQE up to 22.2\% and an EQE of 19.2\% at a brightness of 100 cd m-2. {\textcopyright} 2024 The Author(s). ",

keywords = "carbene, cyclometalate, iridium, near ultraviolet, organic light-emitting diodes, purple",

author = "Jie Yan and Yi Pan and Zhi-Hao Qu and Zihan Xu and Kwok-Chung Law and Dong-Ying Zhou and Liang-Sheng Liao and Yun Chi and Kai-Chung Lau",

year = "2025",

month = may,

doi = "10.1002/adpr.202400151",

language = "English",

volume = "6",

number = "5",

}

TY - JOUR

T1 - Purinylidene-Based Iridium(III) Phosphors for Efficient Purple Phosphorescence and Organic Light-Emitting Devices

AU - Yan, Jie

AU - Pan, Yi

AU - Qu, Zhi-Hao

AU - Xu, Zihan

AU - Law, Kwok-Chung

AU - Zhou, Dong-Ying

AU - Liao, Liang-Sheng

AU - Chi, Yun

AU - Lau, Kai-Chung

PY - 2025/5

Y1 - 2025/5

N2 - It is very challenging to achieve highly efficient and low roll-off purple to deep-blue organic light-emitting diodes (OLEDs) due to the limited selection of suitable emitters. Herein, a series of Ir(III) phosphors-bearing purinylidene-based N-heterocyclic carbene (NHC) chelates are reported, namely, f-ct2a-d, which have successfully turned the emission peak maxima to the purple region (427-432 nm) in degassed toluene, together with high quantum yields of 77%-81%. Notably, f-ct2b is further employed as the phosphorescent dopant in the fabrication of OLEDs to afford deep-blue emission paking at 448 nm and an EQE of 6.7% at 100 cd m-2. Furthermore, a true-blue hyperphosphorescent OLED with 21 wt% of f-ct2a as sensitizer and 1 wt% of ν-DABNA as terminal emitter is also fabricated, giving excellent performance with max. EQE up to 22.2% and an EQE of 19.2% at a brightness of 100 cd m-2. © 2024 The Author(s).

AB - It is very challenging to achieve highly efficient and low roll-off purple to deep-blue organic light-emitting diodes (OLEDs) due to the limited selection of suitable emitters. Herein, a series of Ir(III) phosphors-bearing purinylidene-based N-heterocyclic carbene (NHC) chelates are reported, namely, f-ct2a-d, which have successfully turned the emission peak maxima to the purple region (427-432 nm) in degassed toluene, together with high quantum yields of 77%-81%. Notably, f-ct2b is further employed as the phosphorescent dopant in the fabrication of OLEDs to afford deep-blue emission paking at 448 nm and an EQE of 6.7% at 100 cd m-2. Furthermore, a true-blue hyperphosphorescent OLED with 21 wt% of f-ct2a as sensitizer and 1 wt% of ν-DABNA as terminal emitter is also fabricated, giving excellent performance with max. EQE up to 22.2% and an EQE of 19.2% at a brightness of 100 cd m-2. © 2024 The Author(s).

KW - carbene

KW - cyclometalate

KW - iridium

KW - near ultraviolet

KW - organic light-emitting diodes

KW - purple

UR - https://www.webofscience.com/wos/woscc/full-record/WOS:001354119200001

U2 - 10.1002/adpr.202400151

DO - 10.1002/adpr.202400151

M3 - RGC 21 - Publication in refereed journal

SN - 2699-9293

VL - 6

JO - Advanced Photonics Research

JF - Advanced Photonics Research

IS - 5

M1 - 2400151

ER -

Purinylidene-Based Iridium(III) Phosphors for Efficient Purple Phosphorescence and Organic Light-Emitting Devices

Abstract

Funding

Research Keywords

Publisher's Copyright Statement

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GRF: Transition-Metal Carbene Complexes with Blue Phosphorescence and Metal Assisted Delayed Fluorescence

GRF: Thermally Activated Delayed Fluorescent Organoboron Materials and Hyperphosphorescence

GRF: Iridium(III) Blue Phosphors with Carbene-Based Chromophoric Chelate

Cite this

Purinylidene-Based Iridium(III) Phosphors for Efficient Purple Phosphorescence and Organic Light-Emitting Devices

Abstract

Funding

Research Keywords

Publisher's Copyright Statement

RGC Funding Information

Access Output

Other Access Options

Permanent Link

Other Files and Links

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Projects

GRF: Transition-Metal Carbene Complexes with Blue Phosphorescence and Metal Assisted Delayed Fluorescence

GRF: Thermally Activated Delayed Fluorescent Organoboron Materials and Hyperphosphorescence

GRF: Iridium(III) Blue Phosphors with Carbene-Based Chromophoric Chelate

Cite this