Abstract 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.

中文翻译：

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来自具有持久室温磷光的纯有机分子的高对比度温度响应发光材料

摘要 具有温度响应发光（TRL）的有机材料在温度变化过程中通常表现出发光强度的阶跃变化。持久性室温磷光（pRTP）材料在长寿命三线态激子方面具有显着优势，是很有前途的新型 TRL 材料。在这里，设计并合成了 DA 型二苯甲酮衍生物，即 BrBDBF。有趣的是，发现了 BrBDBF 具有不同 pRTP 特性的两种晶体（BrBDBF-Y 和 BrBDBF-W）。此外，明亮的晶体 BrBDBF-Y 呈现出温度诱导的可调谐发射颜色，从蓝绿色变为黄色。而具有非常弱发射的晶体 BrBDBF-W 表现出高对比度的“开启”发光，随着温度的下降增加了约 40 倍。