Author Affiliations
Abstract
1 Key Laboratory of Material Science and Technology for High Power Lasers, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
2 Graduate University of Chinese Academy of Sciences, Beijing 100049, China
We report the luminescence properties and decay profiles of Ce:YAlO3, Mn:YAlO3; and Ce,Mn:YAlO3 crystals grown by Czochralski method. The spectroscopic properties show that both Mn2+ ions and Mn4+ ions exist in Mn:YAlO3 and Ce,Mn:YAlO3 crystals. The Mn2+ ions have a broad emission band of 60 nm in Mn-doped YAlO3 crystal at 530 nm. The luminescence spectra also indicate that there is significant energy transfer between Ce3+ and Mn4+ in Ce,Mn:YAlO3 crystal. Because of the energy transfer, the first decay component in Ce,Mn:YAlO3 decreases from 24.5 to 10.8 ns, which is much faster than that of Ce:YAlO3.
Mn: YAlO3 Ce Mn:YAlO3 提拉法 衰减时间 荧光 160.5690 Rare-earth-doped materials 300.1030 Absorption 300.2140 Emission 300.6560 Spectroscopy, x-ray Chinese Optics Letters
2010, 8(3): 303
Author Affiliations
Abstract
1 Key Laboratory of Material Science and Technology for High Power Lasers, Shanghai Institute of Optics and Fine Mechanics, Shanghai 201800, China
2 Graduate University of the Chinese Academy of Science, Beijing 100049, China
3 Zhejiang Gemcore Technology Co., Ltd, Wenzhou 325035, China
4 Wenzhou University, Wenzhou 325035, China
YAG:Ce crystal with a diameter of 110 mm is successfully grown by the temperature gradient technique (TGT). The effects of annealing on the luminescence efficiency of YAG:Ce crystal are investigated, and the optimal annealing temperature and atmosphere are obtained. The mechanism of variation behavior of the luminescence efficiency of YAG:Ce under different annealing conditions is discussed and some details on the luminescence associated with color centers are analyzed.
温梯法 YAG: Ce 闪烁体 退火 160.5690 Rare-earth-doped materials 300.1030 Absorption 300.2140 Emission 300.6560 Spectroscopy, x-ray Chinese Optics Letters
2010, 8(2): 199
1 上海光学精密机械研究所 中国科学院强激光材料科学与技术重点实验室,上海 201800
2 中国科学院北京研究生院,北京 100049
3 商丘职业技术学院,河南 商丘 476000
研究了掺铈铝酸钇(Ce:YAP)晶体的自吸收机理以提高其光产额等闪烁性能。用提拉法生长了不同掺杂摩尔分数的Ce:YAP闪烁晶体。室温下测试了不同厚度、不同摩尔分数和不同退火条件下Ce:YAP晶体的透过、荧光、X射线激发发射等光谱特征,并对可能存在的自吸收机理进行了分析。结果表明,Ce:YAP晶体的自吸收主要由Ce4+离子与氧离子配体之间的电荷转移吸收引起,根据电荷转移吸收理论可得其吸收峰在303 nm左右,与实验结果基本一致。本实验表明通过一定的退火工艺和掺杂控制减少Ce4+离子,将能有效地使样品的吸收边蓝移,从而减少Ce:YAP晶体的自吸收,提高闪烁性能。
材料 自吸收 透过率 闪烁体
1 云南省西南林学院基础部, 昆明 650224
2 楚雄师院物电系,云南省楚雄市 67500
3 云南大学测试中心, 昆明 650091
本文首次采用傅里叶变换红外光谱法对节节草茎和根进行了分析, 通过对它们特征峰的指认, 推断出它们富含有淀粉, 氨基酸、皂甙和少量的鞣质等物质。由于它们是同一植物的不同部位, 其红外光谱的吸收峰的位置和强度均有不同,它们具有各自的特征谱, 由峰强比的定量计算得出节节草茎和根的氨基酸含量基本相同, 但节节草茎的淀粉, 皂甙和少量的鞣质等物质的含量远小于根的含量, 根的药用价值大。
傅里叶变换红外光谱法 节节草 特征谱 FT-IR Equisctum ramosissimum Desf Characteristic spectrum
1 云南省西南林学院基础部,昆明,650224
2 楚雄师院物电系,云南省楚雄市,675000
3 云南大学测试中心,昆明,650091
本文首次利用傅里叶红外光谱对翠云草全草和兖州卷柏叶、茎及根的红外光谱图进行了对比研究.结果表明:由于它们所含的化学成分不同和相对含量的差异,其红外光谱的吸收峰的位置和强度均有不同,它们具有各自的特征谱, 为药用蕨类植物鉴定提供了科学依据.
傅里叶变换红外光谱法 翠云草 兖州卷柏 特征峰
为了在既定尺寸下减小斜坡波导和弯曲波导的功耗,设计了4种过渡波导形状函数.用有限差分光束传播法(FD-BPM)进行了模拟分析,发现过渡波导形状的选取与坡度和曲折角存在条件有关,并给出了条件表达式及其详细说明.
光波导 有限差分光束传播法 集成光学 optical waveguide FD-BPM integrated optics
