Abstract
By co-doping Bi3+ and Eu3+, a new color tunable borate phosphor of Sr3Lu(BO3)3: Bi3+, Eu3+ was prepared. The phase structure, elemental distribution, thermal stability and luminescence properties of the synthesized phosphor were studied by XRD, SEM, photoluminescence excitation (PLE) and photoluminescence (PL). The experimental results show that by changing the doping concentration of Eu3+ and regulating the energy transfer Bi3+→Eu3+, the ultra-wide range tuning of phosphor luminescence color from cyan to warm white and then to red is achieved. In addition, the thermal stability measurements of Sr3Lu(BO3)3: 1 at% Bi3+, 8 at% Eu3+ sample demonstrated that the luminous intensity of Bi3+ and Eu3+ at 383 K could still maintain 71.15% and 54.27% of that at room temperature, respectively. Moreover, the prepared white phosphor exhibits a low correlation color temperature (CCT) value of 3436 K. These results show that Sr3Lu(BO3)3: Bi3+, Eu3+ is a kind of promising candidate material for single-phase warm white phosphors.
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