A series of YAG:Ce,Mn transparent ceramics were prepared via a solid-state reaction-vacuum sintering method. The effects of various Mn²⁺–Si⁴⁺ pair doping levels on the structure, transmittance, and luminescence properties were systematically investigated. These transparent ceramics have average grain sizes of 10–16 μm, clean grain boundaries, and excellent transmittance up to 83.4% at 800 nm. Under the excitation of 460 nm, three obvious emission peaks appear at 533, 590, and 745 nm, which can be assigned to the transition 5d→4f of Ce ³⁺ and ⁴T₁→⁶A₁ of Mn²⁺. Thus, the Mn²⁺–Si⁴⁺ pairs can effectively modulate the emission spectrum by compensating broad orange-red and red spectrum component to yield high quality warm white light. After the optimized YAG:Ce,Mn transparent ceramic packaged with blue light-emitting diode (LED) chips, correlated color temperature (CCT) as low as 3723 K and luminous efficiency (LE) as high as 96.54 lm/W were achieved, implying a very promising candidate for application in white light-emitting diodes (WLEDs) industry.

中文翻译：

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发红光的YAG：用于温暖WLED应用的Ce，Mn透明陶瓷

通过固态反应-真空烧结法制备了一系列YAG：Ce，Mn透明陶瓷。系统研究了各种Mn ²⁺ -Si ⁴⁺对掺杂水平对结构，透射率和发光性能的影响。这些透明陶瓷的平均晶粒尺寸为10–16μm，晶界干净，在800 nm处的透射率高达83.4％。在460 nm激发下，三个明显的发射峰出现在533、590和745 nm处，可以归因于Ce ^3+的5d→4f和Mn ^2+的4 T ₁ → ⁶ A ₁的跃迁。因此，Mn ²⁺ –Si ⁴⁺对可以通过补偿宽广的橙红色和红色光谱分量以产生高质量的暖白光来有效地调制发射光谱。经过优化的YAG：Ce，Mn透明陶瓷封装有蓝色发光二极管（LED）芯片，相关色温（CCT）低至3723 K，发光效率（LE）高至96.54 lm / W，这意味着在白光发光二极管（WLED）行业中的应用非常有希望。