Luminescence Spectra of 尾-SiAlON/Pr3+ Under High Hydrostatic Pressure

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• 作者：Sebastian Mahlik ; Agata Lazarowska ; Marek Grinberg ; Tzu-Chen Liu ; Ru-Shi Liu
• 刊名：The Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：June 27, 2013
• 年：2013
• 卷：117
• 期：25
• 页码：13181-13186
• 全文大小：441K
• 年卷期：v.117,no.25(June 27, 2013)
• ISSN：1932-7455

文摘

In this contribution, steady-state and time-resolved photoluminescence spectra of 尾-Si_5.9Al_0.1O_0.1N_7.9/Pr³⁺_0.016 obtained at high hydrostatic pressures up to 260 kbar are presented. At ambient pressure, excitation spectra of the 尾-SiAlON/Pr³⁺ luminescence consist of sharp lines in the spectral region of 20000鈥?2200 cm^鈥? related to the ³H₄ 鈫?³P_0,1,2 transitions and a broad band with two maxima peaking at 30300 and 35700 cm^鈥?, which are related to the ionization of Pr³⁺ ions occupying two different crystallographic sites in the 尾-SiAlON lattice. In both sites, the luminescence spectra consist of the dominant ¹D₂ red emission and ³P₀ blue emission of Pr³⁺ ions. The intensity of luminescence related to transitions from the ³P₀ state and the respective decay time gradually decreases when the pressure increases. The intensity of emission from the ¹D₂ state is independent of the pressure and remains strong over the entire pressure range. Weak dependence of the Pr³⁺ emission on applied pressure can be related to the covalent and strong Pr鈥揘 bonds and specific location of Pr³⁺ ions occupying empty lattice points in 尾-SiAlON.