Details

Autor(en) / Beteiligte

• Pang, Tao
• Wu, Yanyan
• Zhang, Yujian
• Jian, Ronghua
• Mao, Junwen
• Wang, Hong
• Guo, Hai

Titel

Excitation-wavelength-dependent anti-thermal quenching of upconversion luminescence in hexagonal NaGdF:Nd/Yb/Er nanocrystals

Ist Teil von

• Journal of materials chemistry. C, Materials for optical and electronic devices, 2022-03, Vol.1 (13), p.519-5115

Erscheinungsjahr

2022

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Although much effort has been focused on thermally enhanced upconversion (UC) luminescence, it remains a challenge to maintain or even enhance the UC luminescence of NaLnF 4 -based phosphors (Ln = Y, Gd, Lu) using a surface-independent strategy. In this work, we demonstrate that the effect of temperature on UC luminescence in NaGdF 4 :Nd 3+ /Yb 3+ /Er 3+ nanocrystals is strongly dependent on the exciting wavelength. When excited using 808 nm radiation, the UC luminescence exhibits good resistance to thermal quenching. The reason is that, in this situation, the negative effect of multi-phonon decay can be fully compensated by the thermal enhancement in the transition cross-section and in energy-transfer rate. Our research reports a novel strategy for the anti-thermal quenching of upconversion luminescence, which is potentially applicable in the design of dynamic UC anti-counterfeiting as well as in NIR-I-responsive thermometers and nanoheating. Anti-thermally-quenched upconversion luminescence is achieved by designing the composition of the phosphor and matching the appropriate excitation wavelength.