Abstract White light emitting Tm3+/Dy3+ co-doped α-Na3Y(VO4)2 nanocrystals were prepared via citrate based solution combustion route and systematic investigation on the structural and photoluminescence characterization was carried out. The photoluminescence studies of Tm3+/Dy3+ co-doped α-Na3Y(VO4)2 nanocrystals reveal the co-existence of characteristic emissions of Tm3+ and Dy3+ ions. By altering the ratio of Tm3+ and Dy3+ doping concentration, the emission colors can be tailored from blue to yellow through white light region. The systematic fall of emission intensity of Tm3+ ions and the rise of emission intensity of Dy3+ ions along with the decrease of lifetime of Tm3+ emission on increasing the Dy3+ content ascertain the energy transfer from Tm3+ to Dy3+ ions. The CIE chromaticity coordinates for α-Na3Y1-x-yTmxDyy(VO4)2 with x = 0.01 and with y = 0.002 or 0.003 are in close agreement with standard equal energy white light point. The calculated CCT values are 6172 K and 5510 K for the corresponding samples matches with the standard white light illumination (CCT = 5454.12K). These findings indicate that Tm3+/Dy3+ co-doped α-Na3Y(VO4)2 nanocrystals emerge as promising candidates for UV excitable phosphor converted white LED.

中文翻译：

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单相 Tm3+/Dy3+ 共掺杂 Na3Y(VO4)2 纳米晶体的合成、结构和发光表征

摘要 采用柠檬酸盐溶液燃烧法制备了发白光的Tm3+/Dy3+共掺杂α-Na3Y(VO4)2纳米晶，并对其结构和光致发光表征进行了系统研究。Tm3+/Dy3+ 共掺杂 α-Na3Y(VO4)2 纳米晶体的光致发光研究揭示了 Tm3+ 和 Dy3+ 离子的特征发射共存。通过改变 Tm3+ 和 Dy3+ 掺杂浓度的比率，可以定制从蓝色到黄色到白光区域的发射颜色。随着 Dy3+ 含量的增加，Tm3+ 离子发射强度的系统性下降和 Dy3+ 离子发射强度的上升以及 Tm3+ 发射寿命的降低确定了从 Tm3+ 到 Dy3+ 离子的能量转移。α-Na3Y1-x-yTmxDyy(VO4)2 的 CIE 色度坐标，x = 0。01 和 y = 0.002 或 0.003 与标准等能白光点非常吻合。对应样本的计算 CCT 值为 6172 K 和 5510 K，与标准白光照明 (CCT = 5454.12K) 匹配。这些发现表明 Tm3+/Dy3+ 共掺杂的 α-Na3Y(VO4)2 纳米晶体成为紫外可激发磷光体转换白光 LED 的有希望的候选者。