Ceramic phosphor plates of cerium (Ce³⁺)‐doped oxyfluoride were fabricated by the solid‐state reaction method. These phosphors exhibit efficient emission, with the novel feature of color tuning by varying both the doping concentration and excitation wavelength. As the Ce³⁺ concentration increases, the excitation spectrum broadens by a factor of 1.6, and the excitation peak wavelength shifts from 390 to 435 nm, and there is a variation in excitation energy of ~ 10%. Luminescence spectrum of low Ce³⁺ concentration samples is tuned from blue to green with the change of excitation wavelength. The emission peak exhibits a shift of 58 nm into the red spectral region, varying the Ce³⁺ concentration from 0.05 to 0.1 mol%; whereas this shift is only 6 nm when Ce³⁺ content changes from 0.25 to 1 mol%. Photoluminescence (PL) quantum yield has achieved 76%. The crystal structure was examined using X‐ray diffraction to explain its possible influence on the redshift luminescence. A proof of concept of white LED was constructed using a 450 nm blue LED chip with an oxyfluoride phosphor plate, showing a luminous efficacy (LE) of 64 lm/W with a color rendering index of 74.

中文翻译：

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Ce3 +掺杂的氟氧化物陶瓷荧光粉板中的双色调谐，用于白色LED应用

通过固相反应法制备了掺铈（Ce ³⁺）的氟氧化物陶瓷荧光粉板。这些磷光体具有有效的发射功能，具有通过改变掺杂浓度和激发波长来进行颜色调节的新颖功能。随着Ce ³⁺浓度的增加，激发光谱变宽1.6倍，激发峰波长从390 nm移至435 nm，激发能量变化约10％。随着激发波长的变化，低Ce ³⁺浓度样品的发光光谱从蓝色调谐到绿色。发射峰向红色光谱区移动了58 nm，Ce ^3+的浓度从0.05 mol％变为0.1 mol％。但是，当Ce ^3+的含量从0.25变为1 mol％时，该位移仅为6 nm 。光致发光（PL）量子产率已达到76％。使用X射线衍射检查了晶体结构，以解释其对红移发光的可能影响。白色LED的概念验证是使用带有氟氧化磷板的450 nm蓝色LED芯片构建的，其发光效率（LE）为64 lm / W，显色指数为74。