Enhancing upconversion via constructing local energy clusters in lanthanide-doped fluoride nanoparticles

Abstract

By introducing local energy clusters within the NaGdF4 lattice, the optimal Er3+, Ho3+ and Tm3+ doping concentrations were increased to 8, 8, and 2 mol%, respectively. The UC intensity was enhanced approximately 54.3 times by doping Ca2+.

NIR II-responsive core–shell La2O2S:Er3+@La2O2S nanoparticles towards 1.5 μm photodetection

“…It is an ideal candidate for highly sensitive photoactive materials due to its large anti-Stokes shift, excellent photostability, no auto-fluorescence and low toxicity. 9–12 Among the traditional UCL materials, β-NaYF 4 :Yb 3+ ,Er 3+ is normally recognized as the most efficient upconversion phosphor, whose up-conversion quantum yield (UCQY) is about 3–4% under 980 nm excitation. 13 In the past few years, the combination of β-NaYF 4 with semiconductor materials effectively achieved the NIR-I (700–1000 nm) photoelectric detection.…”