Constructing a single-white-light emission by finely modulating the occupancy of luminescence centers in europium-doped (Ca1-xSrx)9Bi(PO4)7 for WLEDs
Constructing a single-white-light emission by finely modulating the occupancy of luminescence centers in europium-doped (Ca1-xSrx)9Bi(PO4)7 for WLEDs
复制标题
通过精细调节 WLED 掺铕 (Ca1-xSrx)9Bi(PO4)7 中发光中心的占据来构建单白光发射
DOI：
10.1039/d0tc02467h
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发表时间：
2020
影响因子：
6.4
通讯作者：
Wang Yuhua
中科院分区：
文献类型：
--
作者：
Cao Yaxin;Wang Xicheng;Ding Jianyan;Zhou Xiaopeng;Seto Takatoshi;Wang Yuhua
目前，磷光体转换的白色发光二极管（WLED）在照明领域引起了极大的关注。目前最常用的将蓝色LED芯片与黄色YAG：Ce磷光体组合的方法由于红色发射的不足而遭受高相关色温（CCT）和低显色指数（CRI）。为了实现具有更高质量的白色光，应当在发射光谱中补充附加的红色分量。在这项研究中，我们提出了一种设计策略，构建一个单一的白光发射荧光粉的光谱修改的基础上结构的演变。在多阳离子位的Ca 9 Bi（PO 4）7：Eu荧光粉中引入锶元素，并对荧光中心的占据率进行精细调制后，实现了具有谱带展宽和红移的可调谐发射。此外，基于（Ca 1-xSrx）9 Bi（PO 4）7：Eu单磷光体获得了Ra为87和CCT为3383 K的暖白色光，这表明其在WLED应用中具有良好的潜力。
Nowadays, phosphor-converted white light-emitting diodes (WLEDs) have drawn great attention in the field of lighting. The most currently used method combining a blue LED chip with a yellow YAG:Ce phosphor suffers from a high correlated color temperature (CCT) and low color rendering index (CRI) due to the deficiency of red emission. For achieving white light with a higher quality, the additional red component should be supplemented in the emission spectrum. In this study, we propose a design strategy to construct a single-white-light-emitting phosphor by modification of the spectrum based on structural evolution. After the introduction of strontium into a multi-cation site Ca9Bi(PO4)7:Eu phosphor and finely modulating the occupancy of the luminescence centers, tunable emission with band broadening and a red-shift was realized. Moreover, warm white light with an Ra of 87 and CCT of 3383 K was obtained based on the (Ca1−xSrx)9Bi(PO4)7:Eu single phosphor, which suggests its good potential in WLED applications.