Harnessing Heavy-Atom Effects in Multiple Resonance Thermally Activated Delayed Fluorescence (MR-TADF) Sensitizers: Unlocking High-Performance Visible-to-Ultraviolet (Vis-to-UV) Triplet Fusion Upconversion

被引：0

作者：

Shi, Yizhong ^{[1
]}

Gou, Haodong ^{[1
]}

Wu, Hao ^{[2
]}

Wan, Shigang ^{[1
]}

Wang, Kai ^{[2
,3
]}

Yu, Jia ^{[2
]}

Zhang, Xiaohong ^{[2
,4
]}

Ye, Changqing ^{[1
]}

机构：

[1] Suzhou Univ Sci & Technol, Sch Mat Sci & Engn, Suzhou 215009, Peoples R China

[2] Soochow Univ, Inst Funct Nano & Soft Mat FUNSOM, Suzhou 215123, Peoples R China

[3] Soochow Univ, Jiangsu Key Lab Carbon Based Funct Mat & Devices, Suzhou 215123, Peoples R China

[4] Soochow Univ, Jiangsu Key Lab Adv Negat Carbon Technol, Suzhou 215123, Peoples R China

来源：

JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2024年 / 15卷 / 17期

基金：

中国国家自然科学基金;

关键词：

COMPLEX; SHELL;

D O I：

暂无

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Ultraviolet (UV) light plays a crucial role in various applications, but currently, the efficiency of generating artificial UV light is low. The visible-to-ultraviolet (Vis-to-UV) system based on the triplet-triplet annihilation upconversion (TTA-UC) mechanism can be a viable solution. Metal-free multiple resonance thermally activated delayed fluorescence (MR-TADF) materials are ideal photosensitizers (PSs) apart from the drawback of high photoluminescence quantum yields (PLQYs). Herein, we systematically investigated the impact of the heavy-atom effect (HAE) on the MR-TADF sensitizers. BNCzBr was then synthesized by incorporating a bromine atom into the skeleton of the precursor BNCz. Impressively, the internal HAE (iHAE) leads to a significantly decreased PLQY and a remarkably increased intersystem crossing quantum yield (Phi(ISC)). Consequently, a higher upconversion quantum efficiency of 12.5% was realized. While the external HAE (eHAE) harms the UC performance. This work guides the further development of MR-TADF sensitizers for high-performance Vis-to-UV TTA-UC systems.

引用

页码：4647 / 4654

页数：8