Investigations of vibrational, structural and optical properties of erbium polyphosphate micro-powders

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• 作者：Jalila Ché ; kir-Mzali ; ^{jalila.chekir@yahoo.fr" class="auth_mail" title="E-mail the corresponding author} ; Karima Horchani-Naifer ; Mokhtar Fé ; rid
• 关键词：Erbium polyphosphate ; Vibrational spectroscopy ; Gap ; Particle size ; Excitation ; Luminescence ; CIE chromaticity coordinates
• 刊名：Optik - International Journal for Light and Electron Optics
• 出版年：2016
• 出版时间：August 2016
• 年：2016
• 卷：127
• 期：16
• 页码：6340-6350
• 全文大小：2416 K

文摘

Polycrystallines powders of KEr(PO₃)₄ are grown by solid state reaction. The obtained powders are identified by X-ray diffraction. This compound crystallizes in the monoclinic system, with space group P2₁/c. Infrared and Raman spectroscopies are used to identify the titled compound. They show that the present structure based upon polyphosphate long chain. The optical properties of the Er³⁺ ions in this compound have been investigated in detail based on the crystal structure, particle-size distribution, the diffuse reflectance, the excitation and the emission spectra. The optical band gap energy (Eg ≈ 4.61 eV) has been calculated from the diffuse reflectance by using the Kubelka–Munk function and Tauc’s relation. The emission and excitation spectra show the characteristic emission bands of Er³⁺ in studied compound. The CIE chromaticity coordinates reveal that this phosphor can be a promising green luminophore for application in LED.