TY - JOUR
T1 - Ultraviolet emissions from Gd3 ions excited by energy transfer from Ho3 ions
AU - Yu, Ying
AU - Zheng, Yangdong
AU - Cheng, Zhemin
AU - Wang, Dan
AU - Liu, Lixin
AU - Qin, Feng
AU - Zheng, Changbin
AU - Zhang, Zhiguo
AU - Cao, Wenwu
N1 - Funding Information:
This work was supported by the 863 Hi-Tech Researches and Development Programs of People’s Republic of China.
PY - 2011/2
Y1 - 2011/2
N2 - Ultraviolet (UV) upconversion (UC) emissions of Gd3 ion were investigated in Y1.838-xGdxYb0.16Ho 0.002O3 (x=0, 0.16, 0.4, 1, 1.4) bulk ceramics under 976 nm laser diode (LD) excitation. The UC emissions centered at 309 and 315 nm are assigned to the transition of 6P5/2→ 8S7/2 (Gd) and 6P7/2→ 8S7/2 (Gd). The 6PJ levels of Gd3 ions are populated by an energy transfer (ET) process from 8S7/2 (Gd)(3P1, 3L 8, 3M10) (Ho)→6PJ (Gd)5I8 (Ho). A four-photon ET UC process was confirmed by the dependence of the 6P7/2 level emission intensity on the pumping power. We found that the intensity of the UC emissions increased with Gd3 ion concentration and peaked at 8 mol%, then starts to decrease until the Gd3 ion concentration reached 70 mol%. The variation in the UV emission intensity is the result of the competition between the ET process and concentration quenching effect. Theoretical calculations based on steady-state equations validated the proposed UC mechanisms.
AB - Ultraviolet (UV) upconversion (UC) emissions of Gd3 ion were investigated in Y1.838-xGdxYb0.16Ho 0.002O3 (x=0, 0.16, 0.4, 1, 1.4) bulk ceramics under 976 nm laser diode (LD) excitation. The UC emissions centered at 309 and 315 nm are assigned to the transition of 6P5/2→ 8S7/2 (Gd) and 6P7/2→ 8S7/2 (Gd). The 6PJ levels of Gd3 ions are populated by an energy transfer (ET) process from 8S7/2 (Gd)(3P1, 3L 8, 3M10) (Ho)→6PJ (Gd)5I8 (Ho). A four-photon ET UC process was confirmed by the dependence of the 6P7/2 level emission intensity on the pumping power. We found that the intensity of the UC emissions increased with Gd3 ion concentration and peaked at 8 mol%, then starts to decrease until the Gd3 ion concentration reached 70 mol%. The variation in the UV emission intensity is the result of the competition between the ET process and concentration quenching effect. Theoretical calculations based on steady-state equations validated the proposed UC mechanisms.
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U2 - 10.1016/j.jlumin.2010.10.042
DO - 10.1016/j.jlumin.2010.10.042
M3 - Article
AN - SCOPUS:78649632993
SN - 0022-2313
VL - 131
SP - 347
EP - 351
JO - Journal of Luminescence
JF - Journal of Luminescence
IS - 2
ER -