Abstract In this work, we reported novel efficient Ce3+/Tb3+ co-doped Ca2GdZr2Al3O12 (CGZA) green-emitting phosphors by traditional solid state method. The phase purity, crystal structure, morphology, photoluminescence properties, internal quantum efficiencies (IQEs), and thermal stability of the samples were systematically investigated. The obtained results revealed that there was an obvious spectral overlap between the emission spectrum of Ce3+ singly doped CGZA phosphors and excitation spectrum of Tb3+ singly doped CGZA phosphors, and efficient energy transfer from Ce3+ to Tb3+ ions existed in Ce3+ and Tb3+ co-doped CGZA phosphors. The Ce3+→Tb3+ energy transfer mechanism was ascribed to the dipole-dipole interaction. The CGZA:Ce3+,Tb3+ phosphors exhibited a broad excitation spectrum in the wavelength range of 370–470 nm with a maximum at 408 nm corresponding to the spin-allowed 4f-5d transition of Ce3+ ions. Upon near-ultraviolet (near-UV) excitation at 408 nm, the composition-optimized CGZA:0.02Ce3+,0.8 Tb3+ sample showed intense sharp narrow-line emissions at 485, 543, 591, 629, 643, 663, and 679 nm due to the 5D4→7FJ (J = 6–0) transitions of Tb3+ ions, along with a good IQE of 51%. Lastly, a white light-emitting diode (LED) device was fabricated by using as-prepared CGZA:0.02Ce3+,0.8Tb3+ green phosphors, commercial BaMgAl10O17:Eu2+ blue phosphors, and CaAlSiN3:Eu2+ red phosphors, and under 300 mA driven current it gave bright warm-white light with a low correlated color temperature of 3969 K and a high color rendering index (Ra = 91.2). Our work provides a new perspective for the design and fabrication of efficient color conversion materials toward near-UV LED-based warm-white LEDs.

中文翻译：

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用于近紫外泵浦高 CRI 暖白光 LED 的高效绿色发光 Ca2GdZr2Al3O12:Ce3+,Tb3+ 荧光粉

摘要 在这项工作中，我们通过传统的固态方法报道了新型高效的 Ce3+/Tb3+ 共掺杂 Ca2GdZr2Al3O12 (CGZA) 绿色荧光粉。系统地研究了样品的相纯度、晶体结构、形貌、光致发光特性、内量子效率 (IQE) 和热稳定性。结果表明，Ce3+单掺杂CGZA荧光粉的发射光谱与Tb3+单掺杂CGZA荧光粉的激发光谱存在明显的光谱重叠，Ce3+和Tb3+共掺杂CGZA荧光粉存在Ce3+向Tb3+离子的高效能量转移. Ce3+→Tb3+ 能量转移机制归因于偶极-偶极相互作用。CGZA:Ce3+, Tb3+ 荧光粉在 370-470 nm 的波长范围内表现出宽的激发光谱，最大值在 408 nm，对应于自旋允许的 Ce3+ 离子的 4f-5d 跃迁。在 408 nm 的近紫外（近紫外）激发下，成分优化的 CGZA:0.02Ce3+,0.8 Tb3+ 样品在 485、543、591、629、643、663 和 679 nm 处显示出强烈的窄线发射到 Tb3+ 离子的 5D4→7FJ (J = 6–0) 跃迁，以及 51% 的良好 IQE。最后，使用所制备的 CGZA:0.02Ce3+,0.8Tb3+ 绿色荧光粉、商业 BaMgAl10O17:Eu2+ 蓝色荧光粉和 CaAlSiN3:Eu2+ 红色荧光粉，在 300 mA 驱动电流下制造白色发光二极管 (LED) 器件产生明亮的暖白光，相关色温低，为 3969 K，显色指数高（Ra = 91.2）。