Ultraviolet C lasing at 263 nm from Ba2LaF7:Yb3+,Tm3+ upconversion nanocrystal microcavities

Ting Wang, Bitao Liu, Yue Lin, Qihua Yang, Wei Gao, Ming Jie Li, Jianbei Qiu, Xue Zhong Yu, Xuhui Xu, Siu Fung Yu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

10 Citations (Scopus)


It is a daunting challenge to realize ultraviolet C (UVC) lasing (i.e., has a wavelength range from 200 to 275 nm) from upconversion nanocrystals due to their low upconversion efficiency. Here, we fabricate Ba2LaF7:Yb3+(90 mol%), Tm3+(5 mol%) upconversion nanocrystals from amorphous borosilicate glass to support emission at ∼263 nm under 980 nm ns laser excitation. The excitation threshold can be further reduced from ∼130 to ∼26.5 mJ/cm2 by using a cylindrical microcavity. We also found that the growth of defect-free Ba2LaF7 nanocrystals with a high concentration of codoping Yb3+ and Tm3+ ions inside high optical damage threshold borosilicate glass is the key to achieving room-temperature UVC upconversion lasing under high-intensity excitation.

Original languageEnglish
Pages (from-to)5986-5989
Number of pages4
JournalOptics Letters
Issue number21
Publication statusPublished - 1 Nov 2020

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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