Emission color shift from green yellow to reddish orange in Eu2+-activated Ca6BaP4O17 by doping high amount of activator ion
Emission color shift from green yellow to reddish orange in Eu2+-activated Ca6BaP4O17 by doping high amount of activator ion
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DOI：
10.1016/j.jlumin.2022.118810
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发表时间：
2022-06
影响因子：
3.6
通讯作者：
Masato Iwaki;Honoka Takahashi;K. Uematsu;K. Toda;Mineo Sato
中科院分区：
文献类型：
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作者：
Masato Iwaki;Honoka Takahashi;K. Uematsu;K. Toda;Mineo Sato
最常见的白光发光二极管（wLED）由蓝色LED（InGaN）和黄色发光Y3 Al 5 O 12：Ce 3+（YAG：Ce 3+）磷光体组成，由于磷光体的弱红色发射而呈现冷白光。因此，开发可由蓝光照射激发的红色发射磷光体对于改善当前wLED的颜色再现性至关重要。在本研究中，我们成功地通过传统的固相反应制备了颜色可调的Ca 6（1-x）Eu 6xBaP 4 O 17（x= 0.01-0.20）荧光粉。通过调节基质晶格中Eu 2+离子的量，可以使Eu 2+激活的Ca 6 BaP 4 O 17荧光粉的发光颜色从绿色黄色变为红橙子。Rietveld精修确定，Eu 2+离子优先占据两个不同的晶体钙网站，CaO 7和CaO 8。制作了原型wLED，并系统地评估了Eu 2+激活的Ca 6 BaP 4 O 17磷光体的光学性质，包括光致发光。其他性能，如寿命和热稳定性也进行了研究。
The most common white-light emitting diodes (wLEDs), which consist of a blue LED (InGaN) and a yellow-emitting Y3Al5O12:Ce3+(YAG:Ce3+) phosphor, exhibit cool-white light due to the weak red emission of the phosphor. Thus, development of red-emissive phosphors that can be excited by blue light irradiation is critically important to improve the color reproducibility of the current wLEDs. In this study, we successfully obtained color-tunable Ca6(1-x)Eu6xBaP4O17(x= 0.01–0.20) phosphors via the conventional solid state reaction. The emission color of Eu2+-activated Ca6BaP4O17phosphors can be varied from green yellow to reddish orange by adjusting the amount of Eu2+ions in the host lattice. As determined by Rietveld refinement, Eu2+ions preferentially occupy two different crystallographic calcium sites, CaO7and CaO8. Prototype wLEDs were fabricated and the optical properties of Eu2+-activated Ca6BaP4O17phosphors, including photoluminescence, were systematically evaluated. Other properties such as lifetime and thermal stability were also studied.