于此所揭露的一些实施例包括具有第一区和第二区的陶瓷体。第一区可包括主体材料及有效引起发光的第一浓度的掺质。第二区可包括主体材料及第二浓度的掺质。在一些实施例中，第一区之平均晶粒尺寸大于第二区之平均晶粒尺寸。在一些实施例中，陶瓷体可呈现较佳的内部量子效率(IQE)。于此所揭露的一些实施例包括于此揭露的陶瓷体的制备方法与使用方法。并且，于此所揭露的一些实施例中还包括照明设备，其具有于此揭露的陶瓷体。

Some embodiments disclosed herein include a ceramic body including a first region and a second region. The first region may include a host material and first concentration of a dopant that is effective to produce luminescence. The second region may include the host material and second concentration of the dopant. In some embodiments, the first region has an average grain size that is larger than an average grain of the second region. The ceramic body may, in some embodiments, exhibit superior internal quantum efficiency (IQE). Some embodiments disclosed herein include methods for the making and using the ceramic bodies disclosed herein. Also, some embodiments disclosed herein lighting apparatuses including the ceramic bodies disclosed herein.