The spectral window of dual visible light emissions of the molecular europium complex that leads to white light can be modulated by design strategy. A europium complex with butterfly structure displays dual emission that leads to single phase white light-emitting molecular complex with excellent colour quality. Such behaviour is not observed with an analogous europium complex with a triangular structure (rather shows usual red emission), suggesting that the partial lighting up of europium ion along with the ligand (antenna) emission (controlled energy transfer from ligand to the Eu(III) ion) is more imperative for the creation of white light. The white light emitting diode (LED) assembled using butterfly europium phosphor as a white emitter yields a bright pure white light with CRI (95%), CCT (5457 K), and CIE (x = 0.33, y = 0.33), whereas the triangle Eu-phosphor displays red light with CIE value of x = 0.58, y = 0.31. The fabricated white/red LED continued to emit a bright white/red light for more than a year. The present design strategy can be widely adapted for the synthesis of single-phase white emitting Eu-phosphor. In addition, the presently studied complexes have also been explored for temperature sensing and as a sensor for vapoluminescence.

中文翻译：

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具有CRI 95％的白色发光euro络合物：蝴蝶与三角形结构

可以通过设计策略来调制导致白光的分子euro络合物的双重可见光发射的光谱窗口。具有蝴蝶结构的euro络合物显示出双重发射，从而导致具有出色色彩质量的单相发白光分子复合物。用具有三角形结构的类似complex络合物（而是显示出通常的红色发射）未观察到这种行为，这表明euro离子的部分点亮以及配体（天线）的发射（从配体到Eu（III）的受控能量转移）离子）对于产生白光更为重要。使用蝴蝶euro磷光体作为白色发射器组装而成的白色发光二极管（LED）产生具有CRI（95％），CCT（5457 K）和CIE（x = 0.33，y = 0.33）的明亮的纯白色光。三角形Eu-磷光体显示CIE值为x = 0.58，y = 0.31的红光。所制造的白色/红色LED继续发出明亮的白色/红色光超过一年。本设计策略可广泛适用于合成单相发射白光的Eu-磷光体。另外，还研究了目前研究的络合物用于温度感测和作为电子发光的传感器。