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Intense upconversion luminescence and energy‐transfer mechanism of Ho 3+ /Yb 3+ co‐doped SrLu 2 O 4 phosphor
Author(s) -
Liu Songbin,
Ye Xinyu,
Liu Shuifu,
Chen Mengyao,
Niu Hu,
Hou Dejian,
You Weixiong
Publication year - 2017
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.14888
Subject(s) - phosphor , luminescence , photon upconversion , analytical chemistry (journal) , materials science , photoluminescence , doping , spectroscopy , chemistry , optoelectronics , physics , chromatography , quantum mechanics
Abstract A series of novel SrLu 2 O 4 : x Ho 3+ , y Yb 3+ phosphors ( x =0.005‐0.05, y =0.1‐0.6) were synthesized by a simple solid‐state reaction method. The phase purity, morphology, and upconversion luminescence were measured by X‐ray diffraction ( XRD ), scanning electron microscopy ( SEM ), and photoluminescence ( PL ) spectroscopy. The doping concentrations and sintering temperature were optimized to be x =0.01, y =0.5 and T =1400°C to obtain the strongest emission intensity. Under 980 nm laser diode excitation, the SrLu 2 O 4 :Ho 3+ , Yb 3+ phosphors exhibit intense green upconversion ( UC ) emission band centered at 541 nm ( 5 F 4 , 5 S 2 → 5 I 8 ) and weak red emission peaked at 673 nm ( 5 F 5 → 5 I 8 ). Under different pump‐power excitation, the UC luminescence can be finely tuned from yellow‐green to green light region to some extent. Based on energy level diagram, the energy‐transfer mechanisms are investigated in detail according to the analysis of pump‐power dependence and luminescence decay curves. The energy‐transfer mechanisms for green and red UC emissions can be determined to be two‐photon absorption processes. Compared with commercial NaYF 4 :Er 3+ , Yb 3+ and common Y 2 O 3 :Ho 3+ , Yb 3+ phosphors, the SrLu 1.49 Ho 0.01 Yb 0.5 O 4 sample shows good color monochromaticity and relatively high UC luminescence intensity. The results imply that SrLu 2 O 4 :Ho 3+ , Yb 3+ can be a good candidate for green UC material in display fields.