Enhanced Luminescence with Fast Nanosecond Lifetime in In2S3:Tb3+ Nanophosphors

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• 作者：Zhifang Li ; Pan Wang ; Tianye Yang ; Hai Yu ; Bingxin Xiao ; Mingzhe Zhang
• 刊名：Journal of Physical Chemistry C
• 出版年：2015
• 出版时间：December 10, 2015
• 年：2015
• 卷：119
• 期：49
• 页码：27688-27694
• 全文大小：445K
• ISSN：1932-7455

文摘

Luminescent inorganic nanoparticles have attracted large amounts of attention because of their enhanced luminescence efficiency and shortening of radiative lifetime, particularly rare earth ion doped nanophosphors that possess excellent luminescent properties as a result of their inner shell electronic transitions between the 4f鈥?f energy levels. Herein, we have investigated the effect of Tb³⁺ content on the absorption, photoluminescence, and luminescence decay curves. The PL spectra give two emission processes, which are assigned to the intrinsic emission and the defect-related emission, respectively. Excess terbium content leads to reducing intensity of photoemission as a result of concentration quenching. The fitted lifetime values are approximately 1 ns and get shortened with the increase of Tb³⁺ content, due to the increased nonradiative transition rate. UV absorption corroborates valence鈥揷onduction band transition and strong quantum size effect. The energy band gap value for Tb³⁺-doped In₂S₃ is higher than that for the pure sample, which is in good agreement with the band structure calculation by using VASP. The In₂S₃:Tb³⁺ nanoparticles show strong quantum confinement effect, large luminescence enhancement, and fast nanosecond lifetime, thus making them a new type of phosphor with potential applications in flat-panel displays, lighting, and field-emission devices.