Perovskite fluoride crystals as light emitting materials in vacuum ultraviolet region

Kohei Yamanoi, Ryosuke Nishi, Kohei Takeda, Yuki Shinzato, Mizuki Tsuboi, Mui Viet Luong, Tomoharu Nakazato, Toshihiko Shimizu, Nobuhiko Sarukura, Marilou Cadatal-Raduban, Minh Hong Pham, Hung Dai Nguyen, Shunsuke Kurosawa, Yuui Yokota, Akira Yoshikawa, Tadashi Togashi, Mitsuru Nagasono, Tetsuya Ishikawa

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)


Vacuum-ultraviolet (VUV) fluorescence from KMgF3 and BaLiF 3 crystals excited by an extreme ultraviolet free electron laser (EUV-FEL) with 61-nm emission wavelength is studied. Cross-luminescence (CL) peaks at 8.5 eV and 7.5 eV, due to an electron from the valence band recombining with a hole in the F2p core band edge are observed in KMgF3. On the other hand, BaLiF3 exhibited a fluorescence peak at 7.75 eV. The band gap energy of BaLiF3 is estimated from its absorption spectrum to be around 8.41 eV. Results suggest the possibility of developing VUV solid-state devices including light emitting diodes.

Original languageEnglish
Pages (from-to)769-772
Number of pages4
JournalOptical Materials
Issue number4
Publication statusPublished - 2014 Feb


  • Fluoride crystal
  • Wide band gap semiconductor
  • X-ray free electron laser


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