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Upconverting YbPO 4 :RE monospheres (RE=Ho, Er, Tm)
Author(s) -
Li JiGuang,
Wang Zhihao,
Zhu Qi,
Xu Zhixin,
Wang Xuejiao,
Kim ByungNam,
Li Xiaodong,
Sun Xudong
Publication year - 2018
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.15811
Subject(s) - photon upconversion , luminescence , calcination , excitation , analytical chemistry (journal) , materials science , laser , infrared , chemistry , optics , optoelectronics , physics , biochemistry , chromatography , quantum mechanics , catalysis
Uniform spheres of (Yb 0.98 RE 0.02 )PO 4 orthophosphate (RE=Ho, Er, and Tm, respectively) were synthesized via a homogeneous precipitation procedure mediated by SO 4 2− anions. The as‐precipitated and 1100°C calcined products were determined via laser‐diffraction particle sizing to have the average diameters of ~2.04 ± 0.67 and 1.80 ± 0.93 μm, respectively. The upconversion luminescence of RE 3+ under sensitization by the host Yb 3+ was studied for the calcination products under 978 nm laser excitation, and it was found that the emissions are dominated by a red band at ~650 nm for Ho 3+ ( 5 F 5 → 5 I 8 transition), similarly strong green (~515‐565 nm, 2 H 11/2 / 4 S 3/2 → 4 I 15/2 transition) and red (~640‐680 nm, 4 F 9/2 → 4 I 15/2 transition) bands for Er 3+ , and a near‐infrared band at ~800 nm for Tm 3+ ( 3 H 4 → 3 H 6 transition). The number of laser photons needed to populate the emitting state was determined by varying the excitation power, and the possible photon reactions leading to the observed upconversion were discussed.