BaSi2O5荧光粉中Eu2+的制备，电子结构和荧光性质

绿色发射磷光剂BaSi2O5：Eu2+是由常见的固体反应合成。在CASTEP代码中，BaSi2O5可视为存在3.2eV直能隙的媒介带隙半导体。正如预期所料的，BaSi2O5光学带隙的计算值比对应的实验值低。200-400nm宽光谱范围可以有效地激活活化的Eu2 的BaSi2O5磷光剂，当最大半宽为95nm时，500nm处有一个发射峰。浓度和发射强度的研究表明Eu2 的最优浓度是0.05mol，当Eu2 容量超过临界值时，会出现浓度淬灭。最优条件的BaSi2O5的外量子效率：在315nm、350nm和365nm的激发下，Eu2 分别是96.1%、70.2%和62.1%。样品优越的光学性能表明绿色发射磷光剂可替代白光LED。

Preparation, electronic structure, and photoluminescent properties of Eu2+ activated BaSi2O5 powder phosphors for solid-state lighting

The green-emitting phosphor BaSi₂O₅:Eu²⁺ was synthesized by the conventional solid state reaction. Using the CASTEP code, BaSi₂O₅ is calculated to be an intermediate band gap semiconductor with an indirect energy gap of about 3. 2 eV. As expected, the calculated optical band gap of BaSi₂O₅ is lower compared to the experimentally determined values. Eu²⁺-activated BaSi₂O₅ phosphor can be excited efficiently over a broad spectral range between 200 and 400 nm, and has an emission peak at 500 nm with a full width at half maximum of 95 nm. The study of concentration-dependent emission intensity shows the optimal concentration of the Eu²⁺ is 0.05 mol, and that concentration quenching occurs when the Eu²⁺ content is beyond the critical value. The external quantum efficiency of the optimized BaSi₂O₅:Eu²⁺ is 96. 1%, 70. 2% and 62. 1% under excitation at 315, 350 and 365 nm, respectively. The superior optical properties of the sample show the potential as an ultraviolet converting green-emitting phosphor for white light emitting diodes.