Synthesis and photoluminescence properties of oxynitride phosphors M_0.98Si₂O₂N₂: (M=Ba, Sr, Ca) using the cellulose assisted liquid phase precursor process

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• 作者：Yelim Song^a ; ¹ ; Younghyun Song^a ; ¹ ; Kenji Toda^b ; Takaki Masaki^a ; Daeho Yoon^a ; ^{dhyoon@skku.edu" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Oxynitride phosphor ; Bluish-green phosphor ; MSi2O2N2 ; White LED ; Eu2+
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：42
• 期：8
• 页码：9667-9672
• 全文大小：2976 K

文摘

Oxynitride phosphors M_0.98Si₂O₂N₂: ${\mathrm{Eu}}_{0.02}^{2+}$ (M=Ba, Sr, Ca) for white LEDs were synthesized at 1300, 1400, and 1500 °C by using the partially cellulose assisted liquid phase precursor (PLPP) process and compared with solid state reaction (SSR) process. MSi₂O₂N₂ (M=Ba, Sr, Ca) crystal structure was obtained from M_0.98Si₂O₂N₂: ${\mathrm{Eu}}_{0.02}^{2+}$ phosphor fired at 1400 °C using the PLPP process. However these phosphors were not synthesized through the SSR process at same temperature. M_0.98Si₂O₂N₂: ${\mathrm{Eu}}_{0.02}^{2+}$ (M=Ba, Sr, Ca) phosphors from PLPP produced a blue color emission at 487 nm (380 nm excitation), a green color emission at 528 nm (374 nm excitation), and a yellow color emission at 538 nm (371 nm excitation). M_0.98Si₂O₂N₂: ${\mathrm{Eu}}_{0.02}^{2+}$ phosphors from PLPP had higher luminescence and crystallinity compared with those obtained from the SSR process. The prepared phosphors were analyzed by X-ray diffraction (XRD), photoluminescence (PL) and field-emission scanning electron microscopy (FE-SEM).