Er0.3Gd0.7VO4晶体红外量子剪裁效应及其在太阳能电池应用上的研究

研究了高浓度的Er_0.3Gd_0.7VO₄晶体材料的红外量子剪裁现象,结果发现光激发²H_11/2能级和⁴G_11/2能级的⁴I_13/2→⁴I_15/2荧光跃迁的近似的量子剪裁效率η’已达约178.55%和177.61% 关键词： 红外的量子剪裁 太阳能电池 0.3Gd_0.7VO₄晶体材料')" href="#">Er_0.3Gd_0.7VO₄晶体材料     

稀土化合物材料上转换发光与激光的研究与进展

多年来凝聚态物质中稀土离子的发光研究一直受到重视。近年来由于半导体激光器的迅速发展与商品化以及高浓度稀土离子激光新材料研究的迅速发展，共振泵浦的紧凑全固化稀土离子固体激光器的研究在国际上已形成一个热潮；带动了固体激光研究的全面复兴。期 中上转换激光器是激光器紧凑全固化潮流的一个最新发展。它是极有的潜力的三种紧凑蓝绿激光器方案之一，弥补了半导体激光向短波长方向发展的不足与困难。它对于发展光盘技术、信     

Er3+:GdVO4中Er3+离子的光谱参数计算和晶场中能级分裂的讨论

对Er3+:GdVO4样品的光谱参数以及Er3+在晶场中能级的分裂情况进行了研究.首先对样品进行了吸收光谱的测量,接着用Judd-Ofelt理论拟合出了Er3+在GdVO4晶体中的强度参量Ωt,并由此计算了跃迁的振子强度、自发辐射跃迁速率、荧光分支比和积分发射截面.通过计算结果可以发现有较多能级之间的跃迁都有大于10-6的振子强度和大于10-18 cm的积分发射截面,并且具有较高的荧光分支比,特别是2H11/2→4I15/2,4S3/2→4I15/2,4F9/2→4I15/2和4I13/2→4I15/2等几个强发光能级除了具有较大的振子强度和积分发射截面外还有很好的应用前景,因此也更加值得关注.最后还利用群论讨论了Er3+离子在GdVO4晶场中各能级的分裂情况并对各Stark子能级的Jz混杂情况进行了分析.     

Optical parameters and energy levels splitting of Ho^3＋ in Ho^3＋： GdVO4

Ho^3＋ ： GdVO4 is a new laser material suitable for high-power laser systems. In this paper we measure the absorption spectra of Ho^3＋ in the sample Ho^3＋： GdVO4. The intensity parameters are calculated by using the Judd-Ofelt theory. Some predicted spectroscopic parameters, such as the spontaneous radiative transition rate, branching ratio and integrated emission cross section are dealt with. And we also compare the optical parameters with those of other materials. From these results, it is found that there are many transitions which have large oscillator strengths and large integrated emission cross sections. Especially the transitions such as ^5 F4 → ^5 I 8, ^5 S2→^5 I8, ^5 F5 → ^5 I8 and ^5 I7 →^ 5 I8 are useful in solid-state lasers and other fields. Finally, we discuss the splitting of the energy levels of Ho^3＋ in the crystal GdVO4 based on the group theory.     

五磷酸镧镱铒非晶在969nm激光激发下的1.54μm激光和上转换发光

本文测量了五磷酸镧镱铒ＹＥＬＰＰ非晶的吸收谱,计算了它的基本光谱参数,用半导体激光纵向泵浦方式,实现了１．５４μｍ微片激光的连续运转,激光输出功率相当稳定,与九十年代初国际上的结果相当;还测量了１．５４μｍ激光有无振荡时的上转换发光,并且对两者的关系进行了初步的讨论     

二氧化钛纳米材料及其能源应用

简要介绍了二氧化钛纳米材料的合成、性质、改性及其在能源方面的应用.其中合成方法包括溶胶凝胶、水/溶剂热、氧化、沉积和超声/微波助合成法:性质包括结构和热力学以及电学和光学性质;改性包括掺杂和敏化;应用包括光催化、光伏打和光解水.     

氟氧化物纳米相玻璃陶瓷Tb(0.7)Yb(5):FOV的合作下转换发光

报道了氟氧化物纳米相玻璃陶瓷Tb(0.7)Yb(5)∶FOV的红外量子剪裁研究,测量了从可见到红外的荧光发光光谱、激发谱、和荧光寿命,分析了{1([5 D4→7 F6](Tb3+),2([2 F7/2→2 F5/2](Yb3+)}的红外量子剪裁现象,发现了487.0nm光激发5 D4能级和378.0nm光激发(5 D3,5 G6)能级的理论量子剪裁效率ηx%Yb依次分别为121.35%和136.27%。首次发现了一种新颖的合作(共协)下转换发光现象{2([(5 D3,5 G6)→5 D4](Tb3+),1([2 F7/2→2 F5/2](Yb3+)},即首次发现施主Tb3+离子释放两个小能量光子[(5 D3,5 G6)→5 D4]的能量,导致出现一个受主Yb3+的[2 F5/2→2 F7/2]的中等能量的光子。     

DCM染料激光激发下的HoP5O14非晶的上转换发光动力学

本文研究了DCM染料激光激发下的HoP5O14非晶在370－580nm兰绿波段上的转换发光的动力学过程,发现离子间能量传递上转换和步进双光子吸收两种要理都共同参与导致了它们的转换发光,而激发光频率的稍微改变会使其上转换动力学发生很大变化。     

Infrared quantum cutting conversion luminescence of Tb(0.7)Yb(3):FOV

The infrared quantum cutting of oxyfluoride nanophase vitroceramics Tb(0.7)Yb(3):FOV has been studied in the present paper. The actual quantum cutting efficiency formula calculated from integral fluorescence intensity is extended to the case of Tb(0.7)Yb(3):FOV. The visible and the infrared fluorescence spectra and their integral fluorescence intensities are measured from static fluorescence experiment. Lifetime curve is measured from dynamic fluorescence experiment. It is found that the total actual quantum cutting efficiency η of the excited ⁵D₄ level is about 93.7%, and that of excited (⁵D₃, ⁵G₆) levels is 93.5%. It is also found that the total theoretical quantum cutting efficiency upper limit η_x%Yb of the 485.5 nm excited <⁵D₄ level is about 121.7%, and that of 378.5 nm excited (⁵D₃, ⁵G₆) levels is 137.2%.     

BLUE-GREEN UP-CONVERSION LUMINESCENCE OF NONCHYSTALLINE HoP5O14 INDUCED BY PULSE DCM DYE LASER

This paper reports the up-conversion luminescence phenomenon in blue-green wave-range of noncrystalline HoP₅O₁₄ induced by pulse DCM dye laser and gives some simple analyses.