Metal-free purely organic phosphors (POPs) are promising materials for display technologies, solid-state lighting, and sensors platforms because of their advantageous properties such as large design windows, easy processability, and economic material cost. Unlike inorganic semiconductors, creating the conditions for triplet excitons to produce light in organic materials is a demanding task because of the presence of electron spin configurations that undergo spin-forbidden transitions, which is usually facilitated by spin–orbit coupling (SOC). In the absence of heavy metals, however, the SOC efficiency in POPs remains low, and consequently, external nonradiative photophysical processes will also severely affect triplet excitons. Addressing these challenges requires the development of rational molecular design principles to accurately account for how all conceivable structural, electronic, chemical, compositional factors affect materials performance.

中文翻译：

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实现快速高效室温磷光的无金属有机磷光体

无金属纯有机荧光粉 (POP) 因其设计窗口大、易于加工和材料成本经济等优点而成为显示技术、固态照明和传感器平台的有前途的材料。与无机半导体不同，为三重态激子在有机材料中产生光创造条件是一项艰巨的任务，因为存在经历自旋禁止跃迁的电子自旋构型，这通常由自旋轨道耦合 (SOC) 促进。然而，在没有重金属的情况下，POPs 中的 SOC 效率仍然很低，因此，外部非辐射光物理过程也会严重影响三重态激子。