The development of efficient near-ultraviolet (near-UV) excitable inorganic phosphors is highly important for application in near-UV-pumped white light-emitting diodes (LEDs). Herein, we reported on a novel efficient rare-earth-free yellow-emitting KCa₂Mg₂V₃O₁₂ vanadate phosphor. These phosphors were prepared by using a conventional high-temperature solid-state reaction method. Photoluminescence study revealed that KCa₂Mg₂V₃O₁₂ phosphor exhibited a broad excitation band in the 250−420 nm wavelength range with a peak at 346 nm, owing to the absorption of [VO₄]³⁻ groups. Upon 346 nm excitation, KCa₂Mg₂V₃O₁₂ phosphor showed bright yellow emission in the 400−800 nm range with a maximum at 540 nm and a full width at half maximum of 161 nm. Such self-activated broadband yellow luminescence was attributed to the ³T₂→¹A₁ and ³T₁→¹A₁ transitions of [VO₄]³⁻ groups. The Commission Internationale de l´Eclairage (CIE) color coordinates were calculated to be (0.3741, 0.4679), which were located in the yellow region in the CIE chromaticity diagram. Impressively, the internal quantum efficiency of KCa₂Mg₂V₃O₁₂ phosphor was measured to be as great as 41 %. In addition, the temperature-dependent emission spectra were recorded, and the activation energy E_a was determined to be 0.366 eV. The newly developed KCa₂Mg₂V₃O₁₂ phosphor might have application potential as color converter in white LEDs.

高效的近紫外（近紫外）可激发无机荧光粉的开发对于近紫外泵浦的白色发光二极管（LED）的应用非常重要。在此，我们报道了一种新型的有效的无稀土发射黄色的KCa ₂ Mg ₂ V ₃ O ₁₂钒酸盐荧光粉。这些荧光体通过使用常规的高温固态反应方法来制备。光致发光研究表明，由于[VO ₄ ] ^3-的吸收，KCa ₂ Mg ₂ V ₃ O ₁₂荧光粉在250-420 nm波长范围内显示出较宽的激发带，并在346 nm处出现峰。组。在346 nm激发后，KCa ₂ Mg ₂ V ₃ O ₁₂磷光体在400-800 nm范围内显示亮黄色发射，最大波长为540 nm，半峰全宽为161 nm。这种自激活的宽带黄色发光归因于[VO ₄ ] ^3-的³ T ₂ → ¹ A ₁和³ T ₁ → ¹ A ₁跃迁。组。计算得出，国际照明委员会（CIE）的颜色坐标为（0.3741，0.4679），位于CIE色度图中的黄色区域。令人印象深刻的是，测得的KCa ₂ Mg ₂ V ₃ O ₁₂荧光粉的内部量子效率高达41％。另外，记录了随温度变化的发射光谱，并且将活化能E _a确定为0.366eV。新开发的KCa ₂ Mg ₂ V ₃ O ₁₂荧光粉可能会在白光LED中用作颜色转换器。