The methods of modulating emitting color are greatly important for up-conversion phosphors to broaden their applications, ranging from information storage to surface display. In this paper, the Ho³⁺/Tm³⁺/Yb³⁺ tri-doped Gd₂(MoO₄)₃ phosphors are synthesized by typical sol-gel method. It is found that the phosphors can radiate intense blue (475 nm), green (542 nm) and red (660 nm) up-conversion luminescence under 980 nm or 915 nm laser excitation. Especially, the emission color of the phosphors can be tuned from red to lavender by adjusting the excitation power of 980 nm or 915 nm continuous lasers. In addition, the up-conversion luminescence is also investigated under the excitation of 980 nm pulse laser. The emission color varies from green to blue and green to yellow by altering the pulse width and frequency, respectively. Combining the above methods, multi-color and white light are realized, indicating the potential application in dynamic colorful display.

调制发射颜色的方法对于上转换磷光体以扩大其应用范围（从信息存储到表面显示）非常重要。在本文中，Ho ³⁺ / Tm ³⁺ / Yb ³⁺三掺杂Gd ₂（MoO ₄）₃磷光体通过典型的溶胶-凝胶法合成。发现在980nm或915nm的激光激发下，磷光体可以发射强烈的蓝色（475nm），绿色（542nm）和红色（660nm）上转换发光。尤其是，可以通过调节980 nm或915 nm连续激光器的激发功率，将磷光体的发射颜色从红色调整为淡紫色。此外，还研究了在980 nm脉冲激光激发下的上转换发光。通过分别改变脉冲宽度和频率，发射颜色从绿色变为蓝色，从绿色变为黄色。结合以上方法，实现了多色和白光，表明了其在动态彩色显示中的潜在应用。