Issue 16, 2023

Peripheral engineering of platinum(ii) dicarbene pincer complexes for efficient blue hyperphosphorescent organic light-emitting diodes

Abstract

Pt(II) dicarbene pincer complexes have been explored as deep-blue phosphors with narrowband emissions. Generally, they form excimers easily and their relatively long emission lifetimes also limit their applications as OLED emitters. Herein, we developed a simple method to modify 1,3-bisimidazol-3-ium pro-chelates and obtained three Pt(II) dicarbene pincer complexes, thus studying the issue of excimer formation vs. peripheral appendages. As a result, blue emissions can be maintained at doping concentrations of up to 20 wt% for IPrtBuPt. Moreover, the emission of IPrtBuPt was found to significantly overlap with the absorption of ν-DABNA, an efficient blue boron/nitrogen based multi-resonant TADF molecule. A hyper-OLED using IPrtBuPt as a sensitizer and ν-DABNA as a terminal emitter achieved EQEs of up to 33.59%, FWHM of 20 nm and CIE coordinates of (0.124, 0.148). These results demonstrated a successful example of utilizing both structural engineering and smart device architecture for getting efficient blue devices with suppressed efficient roll-off.

Graphical abstract: Peripheral engineering of platinum(ii) dicarbene pincer complexes for efficient blue hyperphosphorescent organic light-emitting diodes

Supplementary files

Article information

Article type
Research Article
Submitted
17 3月 2023
Accepted
09 5月 2023
First published
10 5月 2023

Mater. Chem. Front., 2023,7, 3398-3405

Peripheral engineering of platinum(II) dicarbene pincer complexes for efficient blue hyperphosphorescent organic light-emitting diodes

Z. Zhu, J. Yan, L. Fu, C. Cao, J. Tan, S. Wang, Y. Chi and C. Lee, Mater. Chem. Front., 2023, 7, 3398 DOI: 10.1039/D3QM00273J

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