Perovskite fluoride crystals as light emitting materials in vacuum ultraviolet region

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• 作者：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
• 关键词：Fluoride crystal ; X-ray free electron laser ; Wide band gap semiconductor
• 刊名：Optical Materials
• 出版年：February, 2014
• 年：2014
• 卷：36
• 期：4
• 页码：769-772
• 全文大小：1167 K

文摘

Vacuum-ultraviolet (VUV) fluorescence from KMgF₃ and BaLiF₃ 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.