High contrast temperature-responsive luminescence materials from purely organic molecule with persistent room-temperature phosphorescence

作者：Chen, Lifen; Tan, Ji-Hua; Yang, Zhiwen; Qiu, Zhipeng; Mu, Yingxiao^*; Yang, Zhiyong; Chen, Wen-Cheng; Ji, Shaomin; Chi, Zhenguo; Huo, Yanping^*

来源：Journal of Luminescence, 2021, 230: 117731.

DOI：10.1016/j.jlumin.2020.117731

• Persistent room-temperature phosphorescence
• Temperature-responsive luminescence
• Tunable emission color
• Triplet excitons

Organic materials with temperature-responsive luminescence (TRL) generally exhibit step-change of luminescent intensity during temperature variation. The persistent room-temperature phosphorescence (pRTP) materials have significant advantages in long-lived triplet excitons, which are promising new type of TRL materials. Here, a D-A type benzophenone derivative, namely BrBDBF, has been designed and synthesized. Interestingly, two crystals (BrBDBF-Y and BrBDBF-W) with different pRTP properties are found for BrBDBF. In addition, the bright crystal BrBDBF-Y presented a temperature-induced tunable emission color-switching from bluish-green to yellow. While the crystal BrBDBF-W with very weak emission exhibited high contrast "turn-on" luminescence which increased about 40 times as the temperature dropping. These results demonstrate that BrBDBF is a new type of TRL material and provides opportunities for the advanced application of organic pRTP materials.

• 单位
  中山大学; 广东工业大学