MacDougall Sean K W, Ivaturi Aruna, Marques-Hueso Jose, Krämer Karl W, Richards Bryce S
Institute of Photonics and Quantum Sciences, Heriot-Watt University, Edinburgh, EH14 4AS, Scotland.
Opt Express. 2012 Nov 5;20(23):A879-87.
The upconversion photoluminescent quantum yield (PLQY) of erbium-doped hexagonal sodium yttrium fluoride (β-NaYF(4): 10% Er(3+)) was measured under broadband excitation with full width half maxima ranging from 12 to 80 nm. A novel method was developed to increase the bandwidth of excitation, while remaining independent of power via normalization to the air mass 1.5 direct solar spectrum. The measurements reveal that by broadening the excitation spectrum a higher PLQY can be achieved at lower solar concentrations. The highest PLQY of 16.2 ± 0.5% was achieved at 2270 ± 100 mW mm(-2) and is the highest ever measured.
在半高宽范围为12至80纳米的宽带激发下，测量了掺铒六方氟化钠钇（β-NaYF₄: 10% Er³⁺）的上转换光致发光量子产率（PLQY）。开发了一种新方法来增加激发带宽，同时通过归一化到空气质量1.5的直接太阳光谱而与功率无关。测量结果表明，通过拓宽激发光谱，在较低的太阳聚光浓度下可以实现更高的PLQY。在2270±100毫瓦毫米⁻²时实现了最高PLQY为16.2±０.5%，这是有史以来测量到的最高值。
