کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5399204 | 1392675 | 2016 | 39 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Warm white light generation in γ-irradiated Dy3+, Eu3+ codoped sodium aluminoborate glasses
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
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چکیده انگلیسی
This paper mainly emphasizes on the warm white light generation through an energy transfer from Dy3+ to Eu3+; Eu2+ to Dy3+, Eu3+ ions doped in sodium aluminoborate glasses. Absorption and FTIR studies confer that γ-irradiation causes the compaction of the borate network by breaking the bonds between trigonal elements leading to a decrease in the optical band gap. Electron paramagnetic resonance (EPR) confirms the defects induced in glasses by γ-irradiation. The presence of radiation induced defects and the effective energy transfer between the ions make the decay curves change from single exponential (before irradiation) into non-exponential nature (after irradiation). The non-exponential curves are good-fitted to modified Yokota-Tanimoto model for S= 8 indicating that the nature of energy transfer process is of dipole-quadrupole type. The color coordinates are found to fall in the white light zone of the CIE diagram.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Luminescence - Volume 169, Part A, January 2016, Pages 16-23
Journal: Journal of Luminescence - Volume 169, Part A, January 2016, Pages 16-23
نویسندگان
B. Hari Babu, V.V. Ravi Kanth Kumar,