Infrared-to-visible and infrared-to-violet upconversion fluorescence of rare earth doped LaF3 nanocrystals
Wang Yan(王艳)b), Qin Wei-Ping(秦伟平)a)b)† , Di Wei-Hua(狄卫华)b), Zhang Ji-Sen(张继森)b), and Cao Chun-Yan(曹春燕)b)
aState Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China; b Key Laboratory of Excited State Processes, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China
Abstract This paper reports that hexagonal-phase LaF$_{3}$:Yb$^{3 + }_{0.20}$, Er$^{3 + }_{0.02}$ and LaF$_{3}$:Yb$^{3 + }_{0.20}$, Tm$^{3 + }_{0.02}$ nanocrystals (NCs) were synthesized via a hydrothermal method. The transmission electron microscopy, selected area electron diffraction, powder x-ray diffraction, and thermogravimetric analysis are used to characterize the NCs. Under 980 nm excitation, the Yb$^{3 + }$/Er$^{3 + }$ and Yb$^{3 + }$/Tm$^{3 + }$ codoped NCs colloidal solutions present bright green and blue upconversion fluorescence, respectively. These NCs show efficient infrared-to-violet and infrared-to-visible upconversion. The upconversion fluorescence mechanisms of LaF$_{3}$:Yb$^{3 + }_{0.20}$, Er$^{3 + }_{0.02}$ and LaF$_{3}$:Yb$^{3 + }_{0.20}$, Tm$^{3 + }_{0.02}$ NCs are investigated with a 980-nm diode laser as excitation source.
Received: 17 January 2008
Revised: 25 February 2008
Accepted manuscript online:
Fund: Project supported by the National
Natural Science Foundation of
China (Grant Nos 10474096 and 50672030).
Cite this article:
Wang Yan(王艳), Qin Wei-Ping(秦伟平), Di Wei-Hua(狄卫华), Zhang Ji-Sen(张继森), and Cao Chun-Yan(曹春燕) Infrared-to-visible and infrared-to-violet upconversion fluorescence of rare earth doped LaF3 nanocrystals 2008 Chin. Phys. B 17 3300
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