Spectroscopic investigations on Dy3+ ions doped zinc lead alumino borate glasses for photonic device applications
来源期刊：Journal of Rare Earths2019年第1期
论文作者：Nisha Deopa Shubham Saini Sumandeep Kaur Aman Prasad A.S.Rao
文章页码：52 - 59
摘 要：This paper presents the structural, optical absorption, photoluminescence （PL） and decay spectral properties of Dy3+ions doped zinc lead alumino borate （ZPAB） glasses to elucidate their possible usage in photonic devices such as w-LEDs and lasers. A broad hump shown by the XRD spectrum recorded for an un-doped ZPAB glass confirms its non-crystalline nature. The Judd-Ofelt （J-O） intensity parameter evaluated from the measured oscillator strengths of the absorption spectral features were used to estimate various radiative parameters and also to understand the nature of bonding between Dy3+ions and oxygen ligands. Under 350 nm excitation, the as-prepared glasses are exhibiting two emission bands4F9/2→6H15/2（blue）,and4F9/2→6H13/2（yellow） at 483 and 575 nm,respectively. From the PL spectra,the Y/B ratio values, CIE chromaticity color coordinates and color correlated temperature （CCT） were evaluated. The experimental lifetimes measured from the decay profiles are decreasing with increase in Dy3+ions concentration in these glasses which may be attributed to the cross-relaxation and nonradiative multiphonon relaxation process. Decay profiles observed for higher concentration were well fitted to Inokuti-Hirayama （I-H） model to understand the energy transfer process and subsequent decrease in experimental lifetimes. The higher values of radiative parameters, emission cross-sections,quantum efficiency, optical gain and gain band width suggest the suitability of 0.5 mol%of Dy3+ ions in these ZPAB glasses for the photonic device application.
Nisha Deopa，Shubham Saini，Sumandeep Kaur，Aman Prasad，A.S.Rao
Department of Applied Physics, Delhi Technological University
摘 要：This paper presents the structural, optical absorption, photoluminescence （PL） and decay spectral properties of Dy3+ions doped zinc lead alumino borate （ZPAB） glasses to elucidate their possible usage in photonic devices such as w-LEDs and lasers. A broad hump shown by the XRD spectrum recorded for an un-doped ZPAB glass confirms its non-crystalline nature. The Judd-Ofelt （J-O） intensity parameter evaluated from the measured oscillator strengths of the absorption spectral features were used to estimate various radiative parameters and also to understand the nature of bonding between Dy3+ions and oxygen ligands. Under 350 nm excitation, the as-prepared glasses are exhibiting two emission bands4F9/2→6H15/2（blue）,and4F9/2→6H13/2（yellow） at 483 and 575 nm,respectively. From the PL spectra,the Y/B ratio values, CIE chromaticity color coordinates and color correlated temperature （CCT） were evaluated. The experimental lifetimes measured from the decay profiles are decreasing with increase in Dy3+ions concentration in these glasses which may be attributed to the cross-relaxation and nonradiative multiphonon relaxation process. Decay profiles observed for higher concentration were well fitted to Inokuti-Hirayama （I-H） model to understand the energy transfer process and subsequent decrease in experimental lifetimes. The higher values of radiative parameters, emission cross-sections,quantum efficiency, optical gain and gain band width suggest the suitability of 0.5 mol%of Dy3+ ions in these ZPAB glasses for the photonic device application.
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