Pressure-Stimulated Synthesis and Luminescence Properties of Microcrystalline (Lu,Y)3Al5O12:Ce3+ Garnet Phosphors

详细信息    查看全文

• 作者：Victor V. Atuchin ; Nina F. Beisel ; Eugeniy N. Galashov ; Egor M. Mandrik ; Maxim S. Molokeev ; Alexander P. Yelisseyev ; Alexey A. Yusuf ; Zhiguo Xia
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：December 2, 2015
• 年：2015
• 卷：7
• 期：47
• 页码：26235-26243
• 全文大小：562K
• ISSN：1944-8252

文摘

The Lu_2.98Ce_0.01Y_0.01Al₅O₁₂ and Y_2.99Ce_0.01Al₅O₁₂ phosphors were synthesized by solid state reaction at temperature 1623 K and pressure 1.5 脳 10⁷ Pa in (95% N₂ + 5% H₂) atmosphere. Under the conditions, the compounds crystallize in the form of isolated euhedral partly faceted microcrystals 鈭?9 渭m in size. The crystal structures of the Lu_2.98Ce_0.01Y_0.01Al₅O₁₂ and Y_2.99Ce_0.01Al₅O₁₂ garnets have been obtained by Rietveld analysis. The photoluminescence (PL) and X-ray excited luminescence (XL) spectra obtained at room temperature indicate broad asymmetric bands with maxima near 519 and 540 nm for Y_2.99Ce_0.01Al₅O₁₂ and Lu_2.98Ce_0.01Y_0.01Al₅O₁₂, respectively. The light source was fabricated using the powder Lu_2.98Ce_0.01Y_0.01Al₅O₁₂ phosphor and commercial blue-emitting n-UV LED chips (位_ex = 450 nm). It is found that the CIE chromaticity coordinates are (x = 0.388, y = 0.563) with the warm white light emission correlated color temperature (CCT) of 6400 K and good luminous efficiency of 110 lm/W.