A new method for improving color rendering index (CRI) and low correlated color temperature (CCT) in high‐power white‐light‐emitting diodes (WLEDs) is proposed. We used a configuration of phosphor‐in‐glass (PIG) and studied light output changes with the increment in concentration of yellow‐emitting Y₃Al₅O₁₂:Ce³⁺ (YAG:Ce³⁺) phosphor. The PIG was coupled on the top of blue‐light‐emitting diodes (LED) chip (465 nm). To compensate the lack of red emission in the phosphor, Eu³⁺‐doped tellurium glass with different europium content was employed as a red emitter. The suitable contents of YAG:Ce³⁺ and Eu³⁺ were 7.5 weight percent (wt%) and 3 mol percent (mol%), respectively. The CRI value went from 72 to 82, whereas the CCT was reduced from 24 933 to 6434 K. The proposed structure can improve CCT as well as CRI of WLEDs just by placing a glass on top.

中文翻译：

---

掺Eu3 +的玻璃作为玻璃荧光粉中的显色指数增强剂

提出了一种提高大功率白光发光二极管（WLED）的显色指数（CRI）和低相关色温（CCT）的新方法。我们使用玻璃荧光粉（PIG）的配置，并研究了随着发黄光的Y ₃ Al ₅ O ₁₂：Ce ³⁺（YAG：Ce ³⁺）荧光粉浓度的增加而产生的光输出变化。PIG耦合在蓝色发光二极管（LED）芯片（465 nm）的顶部。为了弥补磷光体中红色发射的不足，采用了euro含量不同的Eu ³⁺掺杂碲玻璃作为红色发射器。YAG：Ce ³⁺和Eu ³⁺的合适含量分别为7.5重量％（wt％）和3mol％（mol％）。CRI值从72降低到82，而CCT从24 933降低到6434K。仅通过将玻璃放在顶部，所提出的结构就可以改善WLED的CCT和CRI。