单带上转换红光发射在高分辨生物标记及三维彩色显示方面具有重要应用。本文针对Ho3+/Ce3+共掺杂纳米体系单带上转换红光较弱的问题，设计制备了染料(IR-806)敏化的NaYF4∶Yb/Ho/Ce(20%/2%/10%) @NaYF4∶Nd(20%)纳米晶，显著增强了上转换红光发射。采用溶剂热法制备了均匀的上转换纳米粒子，通过调控核内部Ce3+离子掺杂浓度比例(0~10%)逐步获得单带上转换红光发射。在此基础上，通过上转换纳米粒子表面连接近红外IR-806染料分子，808 nm激发下其上转换发光强度提高了约22倍，特别地，红绿荧光强度比从4.8增至8.4。结果表明，染料敏化可用于增强上转换单带红光发射，并提高红光色纯度，这有利于高清晰的生物成像应用。

Single-band red upconversion emission has important applications for high-resolution biomarkers and 3-dimensional color display. However, the cross-relaxation of Ho3+/Ce3+ co-doping system normally yield the weak single-band red emission. In this paper, the dye-sensitized NaYF4∶Yb/Ho/Ce(20%/2%/10%)@NaYF4∶Nd(20%) nanoparticles were prepared to address such an issue. Highly uniform upconversion nanoparticles were prepared by solvothermal method, and the single-band red emission was obtained by increasing the Ce3+ doping concentration (from 0% to 10%) inside the core. When the near-infrared dyes of IR-806 were further conjugated, the upconversion luminescence intensity exhibited a 22-fold enhancement, and the red-to-green emission ratio also increased from 4.8 to 8.4. This paper provides a new way to improve the intensity and the purity of single-band red upconversion luminescence through dye sensitization, which is beneficial to high-resolution bioimaging.