Journal
NANOSCALE
Volume 11, Issue 11, Pages 4959-4969Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8nr10332a
Keywords
-
Categories
Funding
- Swedish Research Council (Vetenskapsradet) [2016-03804, 2016-03619]
- COST Action The European Upconversion Network From the Design of Photon-Upconverting Nanomaterials to Biomedical Applications [CM1403]
- National Natural Science Foundation of China [61675071]
- Guangdong Provincial Science Fund for Distinguished Young Scholars [2018B030306015]
- Pearl River S and T Nova Program of Guangzhou [201710010010]
- open fund of the State Key Laboratory of Modern Optical Instrumentation of Zhejiang University [MOIKF201801]
- Swedish Research Council [2016-03804, 2016-03619] Funding Source: Swedish Research Council
Ask authors/readers for more resources
In this study, we systematically investigate the decay characteristics of upconversion luminescence (UCL) under anti-Stokes excitation through numerical simulations based on rate-equation models. We find that a UCL decay profile generally involves contributions from the sensitizer's excited-state lifetime, energy transfer and cross-relaxation processes. It should thus be regarded as the overall temporal response of the whole upconversion system to the excitation function rather than the intrinsic lifetime of the luminescence emitting state. Only under certain conditions, such as when the effective lifetime of the sensitizer's excited state is significantly shorter than that of the UCL emitting state and of the absence of cross-relaxation processes involving the emitting energy level, the UCL decay time approaches the intrinsic lifetime of the emitting state. Subsequently, Stokes excitation is generally preferred in order to accurately quantify the intrinsic lifetime of the emitting state. However, possible cross-relaxation between doped ions at high doping levels can complicate the decay characteristics of the luminescence and even make the Stokes-excitation approach fail. A strong cross-relaxation process can also account for the power dependence of the decay characteristics of UCL.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available