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Structural, luminescence, energy transfer mechanism, and photometric properties of Sm3+ -doped KYBO phosphors
Radiation Physics and Chemistry ( IF 2.8 ) Pub Date : 2021-09-20 , DOI: 10.1016/j.radphyschem.2021.109791
G. Sowjanya 1 , Ramachari Doddoji 2, 3 , Vasudeva Reddy Minnam Reddy 4
Affiliation  

Potassium yttrium borate (KY(1-x)SmxBO3) referred as KYBO:Sm3+ phosphors with the varying of Sm3+ ions (x = 0.005, 0.01, 0.05, 0.1, 0.2, 0.3, 0.5 mol%) were fabricated via the solid-state reaction process. The structural and optical studies were systematically investigated via X-ray diffractometer (XRD), excitation (PLE), emission (PL) spectra, and decay curves. The structure of KYBO:Sm3+ phosphors is attributed to hexagonal with an average particle size of 34 nm. Scanning electron microscopy (SEM) image and energy dispersive X-ray analysis (EDAX) spectrum were also studied. The dominant excitation wavelength at 406 nm is ascribed to 6H5/2 → 4F7/2 transition and the emission spectra exhibits three peaks at 573, 609 and 656 nm belonging to 4G5/2 → 6H5/2, 7/2, 9/2 transitions of Sm3+ ions, respectively. Critical distance (Rc) and energy transfer rates (Arad) were also calculated. The energy transfer (ET) mechanism from luminescence spectra was proved by Dexter and Schulman theory. The decay of 4G5/2 level for KYBO:Sm3+ phosphors exhibited non-exponential nature by shortening the lifetime from 1.85 to 0.3 ms. Moreover, the photometric parameters such as color coordinates (0.557, 0.440), correlated color temperatures (CCT:1784–2552 K), and color purity (CP:93–96%) were also obtained for KYBO:Sm3+ phosphors. These results considered to be in the orange-red emission region for warm white light-emitting diodes.



中文翻译:

Sm3+ 掺杂 KYBO 荧光粉的结构、发光、能量转移机制和光度特性

硼酸钇钾 (KY (1-x) Sm x BO 3 ) 称为 KYBO:Sm 3+荧光粉,随 Sm 3+离子的变化(x = 0.005, 0.01, 0.05, 0.1, 0.2, 0.3, 0.5 mol%)是通过固态反应过程制造的。通过 X 射线衍射仪 (XRD)、激发 (PLE)、发射 (PL) 光谱和衰减曲线系统地研究了结构和光学研究。KYBO:Sm 3+荧光粉的结构属于六边形,平均粒径为34 nm。还研究了扫描电子显微镜 (SEM) 图像和能量色散 X 射线分析 (EDAX) 光谱。406 nm 处的主要激发波长归因于6 H 5/2 →  4 F 7/2跃迁和发射光谱在 573、609 和 656 nm 处显示三个峰,分别属于 Sm 3+离子的4 G 5/2  →  6 H 5/2、7/2、9/2跃迁. 还计算了临界距离 (R c ) 和能量转移率 (A rad )。Dexter 和 Schulman 理论证明了来自发光光谱的能量转移 (ET) 机制。KYBO:Sm 3+ 4 G 5/2电平衰减通过将寿命从 1.85 毫秒缩短到 0.3 毫秒,荧光粉表现出非指数性质。此外,还获得了 KYBO:Sm 3+荧光粉的光度参数,例如色坐标 (0.557, 0.440)、相关色温 (CCT:1784–2552 K) 和色纯度 (CP:93–96%) 。这些结果被认为是在暖白色发光二极管的橙红色发射区域内。

更新日期:2021-09-22
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