KY3F10:Yb3+,Tm3+,Ho3+纳米晶在单一980 nm辐射下的色稳定上转换白光

利用简单的水热法制备了立方相KY₃F₁₀∶15% Yb³⁺，0.5% Tm³⁺，0.2% Ho³⁺上转换纳米晶。在980 nm激发下，获得接近等能白的上转换发光。上转换机理分析表明，蓝、绿、红光发射分别源自Yb³⁺到Tm³⁺和Ho³⁺的能量传递。更重要的是，该上转换白光显示了良好的色稳定性。当泵浦功率由688 mW增加到1 688 mW，色差仅为0.027 5。其原因在于，一方面三基色发光的功率关系比较接近；另一方面蓝光的功率关系随泵浦功率的增加逐渐减小，而绿、红光的功率关系保持不变。蓝光的饱和现象可能与激光辐射所引起的热效应有关。

Color Stable Upconversion White Emission of KY3F10: Yb3+,Tm3+,Ho3+ Nanocrystals Under Single 980 nm Excitation

Cubic KY₃F₁₀:15% Yb³⁺,0.5% Tm³⁺,0.2% Ho³⁺ upconversion nanocrystals were synthesized by a simple hydrothermal method. Under the excitation of 980 nm, the upconversion luminescence with chromaticity coordinates nearby equal energy white was obtained. The analysis of the upconversion mechanism shows that the blue, green, and red emissions originate from the energy transfer from Yb³⁺ to Tm³⁺ and Ho³⁺, respectively. More importantly, it is found that the upconversion white emission shows favorable color stability. When the pump power increases from 688 mW to 1 688 mW, the aberration is only 0.027 5. The reason is that, on the one hand, the power dependences of the three primary colors are relatively close to each other. On the other hand, the power dependence of the blue emission gradually decreases as the pump power increases, while the power dependences of the green and red emissions remain unchanged. The saturation of blue emission may be related to the thermal effect caused by laser radiation.