环境相关的 Eu2+-活化 Ba3CaK(PO4)3 通过 (BO3)3– 阴离子基团的化学共取代向白光发射,Inorganic Chemistry

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环境相关的 Eu2+-活化 Ba3CaK(PO4)3 通过 (BO3)3– 阴离子基团的化学共取代向白光发射
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2022-09-04 , DOI: 10.1021/acs.inorgchem.2c02462
Guodong Xie ₁ , Jiayong Si ₁ , Guihua Li ₂ , Gemei Cai ₂

Affiliation

对于磷光体转换的白光发光二极管，迫切需要研究在单个组件中掺杂有单一活化剂的磷光体以实现白光发射。本工作基于化学单元共取代策略，制备了具有混合阴离子基团的新型硼磷酸盐Ba ₃ CaK(PO ₄ ) _{3– x} (BO ₃ ) _x :0.02Eu ^{2+ 。}耦合结构细化和光致发光分析，Ba ₃ CaK(PO ₄ ) _{3– x} (BO ₃ ) _x由五个具有不同配位环境的不同阳离子位点组成，其中 Eu²⁺占据了 Ba ²⁺的三个位点。_{在将(BO 3} ) ^3-部分取代为(PO ₄ ) ^3-的过程中，由于两个阴离子基团的几何构型不同而产生的配位场发生很大畸变，导致发射带的红移和展宽发生，导致从蓝色到白色的颜色可调发射。已成功制造了一种磷光体转换发光二极管，并结合了所制备的 Ba ₃ CaK(PO ₄ ) _2.6 (BO ₃ ) _0.4 :0.02Eu ²⁺荧光粉和 405 nm 近紫外芯片，其显示国际委员会 de I'Eclairage 色度坐标为 (0.31, 0.37)，相关色温为 6295 K。如目前的工作所示，从磷酸盐到硼磷酸盐采用的方法是致力于开发高质量的荧光粉。

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Environment-Dependent Eu2+-Activated Ba3CaK(PO4)3 toward White-Light Emission by Chemical Cosubstitution of the (BO3)3– Anion Group

Investigating the phosphors doped with single activators in a single component to realize white-light emission is urgently desired for phosphor-converted white-light-emitting diodes. In this work, on the basis of the chemical unit cosubstitution strategy, the new borophosphate phosphors Ba₃CaK(PO₄)_3–x(BO₃)_x:0.02Eu²⁺ with a mixed anion group were prepared. Coupling structure refinement and photoluminescence analyses, Ba₃CaK(PO₄)_3–x(BO₃)_x consists of five different cationic sites with different coordination environments, with Eu²⁺ occupying the three sites for Ba²⁺. In the process of partial substituting (BO₃)^3– for (PO₄)^3–, because of the greatly distorted coordination field generated from the difference in the geometric configurations between the two anion groups, a red shift and broadening of the emission bands occurs, resulting in a color-adjustable emission from blue to white. A phosphor-converted light-emitting diode has been successfully fabricated with the incorporation of an as-prepared Ba₃CaK(PO₄)_2.6(BO₃)_0.4:0.02Eu²⁺ phosphor and a 405 nm near-ultraviolet chip, which exhibits Commission International de I’Eclairage chromaticity coordinates of (0.31, 0.37) and a correlated color temperature of 6295 K. As demonstrated in the present work, an approach adopted from phosphate to borophosphate is conducted to develop high-quality phosphors.

更新日期：2022-09-04

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