Phosphor‐converted white light‐emitting diodes (LEDs) are currently playing key roles in the lighting and display industries and trigger urgent demands for the discovery of “good” phosphors with high quantum efficiency, improved thermal stability, and controllable excitation/emission properties. Herein, a general and efficient heterovalent substitution strategy is demonstrated in K₂HfSi₃O₉:Eu²⁺ achieved by Ln³⁺ (Ln = Gd, Tb, Dy, Tm, Yb, and Lu) doping to optimize luminescence properties, and as an example, the Lu³⁺ substitution leads to improvement of emission intensity and thermal stability, as well as tunable emission color from blue to cyan. The structural stability and Eu²⁺ occupation via Lu³⁺ doping have been revealed by the structural elaboration and density functional theory calculations, respectively. It is shown that heterovalent substitution allows predictive control of site preference of luminescent centers and therefore provides a new method to optimize the solid‐state phosphors for LEDs.

中文翻译：

---

通过异质取代策略控制相稳定性来设计高性能LED荧光粉

磷光转换的白光发光二极管（LED）当前在照明和显示行业中发挥着关键作用，并引发了对发现具有高量子效率，改善的热稳定性和可控制的激发/发射特性的“优质”磷光体的迫切需求。本文中，通过掺杂Ln ³⁺（Ln = Gd，Tb，Dy，Tm，Yb和Lu）实现了K ₂ HfSi ₃ O ₉：Eu ^2+的掺杂和优化发光性能，从而证明了一种通用且有效的杂种取代策略。例如，Lu ³⁺取代可以改善发光强度和热稳定性，并可以调节从蓝色到青色的发光颜色。结构稳定性和Eu通过结构精细化和密度泛函理论计算分别揭示了通过Lu ³⁺掺杂获得的²⁺占领。结果表明，异价取代可以预测性控制发光中心的位置，因此提供了一种优化LED固态磷光体的新方法。