Blue-Pumped Deep Ultraviolet Lasing from Lanthanide-Doped Lu6O5F8 Upconversion Nanocrystals

Yangyang Du, Yunfeng Wang, Zhiqin Deng, Xian Chen, Xueqing Yang, Tianying Sun, Xin Zhang, Guangyu Zhu, Siu Fung Yu, Feng Wang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

42 Citations (Scopus)


Deep ultraviolet (UV) lasers are essential for enormous use ranging from medical and life science to environmental and industrial applications. Herein, a class of blue-pumped microcavity lasers operating in the deep UV region is demonstrated by using Lu6O5F8:Pr/Gd@Lu6O5F8 upconversion nanocrystals as the gain medium. A hot-injection synthesis is developed for tuning dimensions of the Lu6O5F8 nanocrystals. By synthesizing large-sized nanocrystals and using inert shell coating, deep ultraviolet emission at 315 nm by blue excitation at 447 nm is realized for the first time in colloidal solutions. Mechanistic investigations suggest that the upconversion stems from sequential absorption of two blue photons by Pr3+ ions followed by energy transfer to Gd3+ emitters. By virtue of their small particle size and high dispersibility, the upconversion nanocrystals are readily incorporated into silica resin microcavities with a bottle-like geometry. Lasing emissions of tunable optical characteristics are achieved from the microcavities through the formation of whispering gallery modes. These findings pave the way for constructing compact lasers operating in the deep UV regime by pumping with sophisticated long-wavelength lasers.

Original languageEnglish
Article number1900968
JournalAdvanced Optical Materials
Issue number2
Publication statusPublished - 17 Jan 2020


  • core–shell
  • microcavity lasers
  • oxyfluoride
  • upconversion nanocrystals
  • whispering gallery modes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics


Dive into the research topics of 'Blue-Pumped Deep Ultraviolet Lasing from Lanthanide-Doped Lu6O5F8 Upconversion Nanocrystals'. Together they form a unique fingerprint.

Cite this