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| 1 | Spectroscopic investigations on Dy^(3+) ions doped zinc lead alumino borate glasses for photonic device applications显示文摘This paper presents the structural, optical absorption, photoluminescence (PL) and decay spectral properties of Dy^(3+)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 Dy^(3+)ions and oxygen ligands. Under 350 nm excitation, the as-prepared glasses are exhibiting two emission bands^4F_(9/2)→~6H_(15/2)(blue),and^4F_(9/2)→~6H_(13/2)(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 Dy^(3+)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 Dy^(3+) ions in these ZPAB glasses for the photonic device application. | Nisha Deopa Shubham Saini Sumandeep Kaur Aman Prasad A.S.Rao | 2019 | Journal of Rare Earths2019，37，1： | 4 |
| 2 | Purification and characterization of a thermophilic and acidophilic chitinase from Microbispora sp. V2显示文摘 | N.N.Nawani B.P.Kapadnis A.D.Das A.S.Rao S.K.Mahajan | 2002 | Journal of Applied Microbiology2002，，6： | 1 |
| 3 | Enhanced visible green and 1.5μm radiative emission of Er^(3+)ions in Li_(2)O-PbO-Al_(2)O_(3)-B_(2)O_(3) glasses for photonic applications显示文摘A series of Er^(3+)ions doped lithium lead alumino borate(LiPbAlB)glasses were synthesized via melt quench method and their structural,physical and optical properties were studied.Judd-Ofelt theory in correlation with the emission and absorption profiles was performed for the measurement of various radiative parameters for different transitions of Er^(3+)doped glasses.The as-prepared glasses show deep green(550 nm)as well as NIR(1532 nm)emission at 380 and 980 nm excitation wavelengths,respectively.The intensity of emission spectra increases with Er^(3+)ions concentration up to 1.5 mol%and beyond quenching is observed.The Dexter theory applied to the emission profiles reveals the interaction between Er^(3+)ions as dipole-dipole in nature.CIE color coordinates are found to fall in the green region of the visible spectrum.It is observed that 1.5 mol%of Er^(3+)ions concentration is optimum to exhibit the maximum quantum efficiency,branching ratios,gain bandwidth,emission cross-section,gain crosssection and aptly suitable for visible and NIR photonic applications. | Nisha Deopa Mukesh K.Sahu Sumandeep Kaur Aman Prasad K.Swapna Vinay Kumar R.Punia A.S.Rao | 2021 | Journal of Rare Earths2021，39，5： | 0 |
| 4 | 水冷堆堆内构件的辐照效应评价——应力腐蚀开裂效应和奥氏体不锈钢裂纹扩展速率显示文摘由于奥氏体不锈钢具有较高的强度、韧性和断裂韧性,被作为结构材料广泛用于水冷堆堆内构件中。但是,由于长期暴露在中子辐照环境中,材料的微观结构和微观组分发生了变化(如辐照硬化和辐照引发析出),断裂韧性也开始下降。辐照促进应力腐蚀开裂(IASCC)是暴露在中子辐照环境中的堆内构件的一种降质过程。本文综述现有的奥氏体不锈钢辐照数据,评价了影响水冷堆IASCC效应和裂纹扩展速率的主要参数,如材料的化学组分、辐照剂量、水化学等。本文的结果可用于筛选IASCC的中子注量阈值和周期性裂纹扩展速率处理曲线和IASCC裂纹扩展速率处理曲线。 | O.K.Chopra A.S.Rao | 2012 | 国外核动力2012，33，5： | 0 |
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