Open AccessOn the Er3+ NIR photoluminescence at 800 nm
Author(s) -
Leipeng Li,
Yuan Zhou,
Feng Qin,
Yangdong Zheng,
Zhiguo Zhang
Publication year - 2020
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.386792
Subject(s) - photoluminescence , phosphor , excited state , materials science , photoluminescence excitation , analytical chemistry (journal) , optics , relaxation (psychology) , atomic physics , optoelectronics , physics , chemistry , chromatography , psychology , social psychology
Here, we study the Er 3+ NIR 4 I 9/2 - 4 I 15/2 photoluminescence peaking at 800 nm. It can be detected with a good signal-to-noise for the prepared CaWO 4 :Yb 3+ ,Er 3+ phosphors upon excitation at 980 nm. When directly exciting the Er 3+ green and red emitting states over the 333-773 K temperature range, the 800 nm photoluminescence for the samples is undetectable. It shows that the non-radiative relaxation from the upper excited states to the 4 I 9/2 emitting state is extremely inefficient. Moreover, the 800 nm photoluminescence decay curve is measured at high temperatures. It is found that the 800 nm emission always has a similar lifetime with the Er 3+ 4 I 11/2 - 4 I 15/2 transition. This reminds us that the Er 3+ 4 I 9/2 state is mainly populated by the adjacent lower 4 I 11/2 state by a thermally coupled way.