Ce3+在Ba2ZnB2O6中的晶体学格位及其发光性能研究

通过高温固相法合成了Ba2ZnB2O6∶Ce3+蓝色荧光粉.通过XRD、Rietveld结构精修、激发和发射光谱、荧光衰减曲线以及变温荧光光谱等,对荧光粉的晶体结构和发光性能进行了研究.结果表明:Ce3+的掺入并未对基质的晶格结构产生影响,在350 nm近紫外光激发下,Ba2ZnB2O6∶xCe3+的发射峰为位于430 nm的不对称的宽谱,最佳掺杂浓度为x=0.01,Ce3+在Ba2ZnB2O6晶格中占据Bal和Ba3两种格位,随掺杂浓度升高更倾向于占据Ba3位.Ce3+的择优占位使荧光粉的发光由蓝光向蓝绿色区域发生了明显的漂移.     

Interfaces of high-efficiency kesterite Cu_2ZnSnS(e)_4 thin film solar cells

Cu_2ZnSnS(e)_4(CZTS(e)) solar cells have attracted much attention due to the elemental abundance and the nontoxicity.However,the record efficiency of 12.6% for Cu_2ZnSn(S,Se)_4(CZTSSe)solar cells is much lower than that of Cu(In,Ga)Se_2(CIGS)solar cells.One crucial reason is the recombination at interfaces.In recent years,large amount investigations have been done to analyze the interfacial problems and improve the interfacial properties via a variety of methods.This paper gives a review of progresses on interfaces of CZTS(e)solar cells,including:(i)the band alignment optimization at buffer/CZTS(e)interface,(ii)tailoring the thickness of MoS(e)_2 interfacial layers between CZTS(e)absorber and Mo back contact,(iii)the passivation of rear interface,(iv)the passivation of front interface,and(v)the etching of secondary phases.     

用于肿瘤成像的半乳糖/酞菁近红外荧光探针

本文首次报道半乳糖酞菁近红外荧光探针在肿瘤成像方面的应用。以酞菁为荧光发射基团,其在近红外区域有较高的量子产量和光学稳定性,可以解决探针的近红外光学特性;通过半乳糖对酞菁的修饰能够改善探针的溶解性和生物相容性,而且利用半乳糖的肿瘤靶向功能可以提高探针肿瘤主动靶向成像效果。结果表明它对恶性肿瘤具有高特异性结合和高灵敏度的分子探针体系,提高近红外光学分子成像效果。     

Dynamic scaling and optical properties of Zn（S,O, OH） thin film grown by chemical bath deposition

The scaling behavior and optical properties of Zn(S, O and OH) thin films deposited on soda-lime glass substrates by chemical bath deposition method were studied by combined roughness measurements, scanning electron microscopy and optical properties measurement. From the scaling behaviour, the value of growth scaling exponent β , 0.38±0.06, was determined. This value indicated that the Zn(S, O, OH) film growth in the heterogeneous process was influenced by the surface diffusion and shadowing effect. Results of the optical properties measurements disclosed that the transmittance of the film was in the region of 70%-88% and the optical properties of the film grown for 40 min were better than those grown under other conditions. The energy band gap of the film deposited with 40 min was around 3.63 eV.     

掺钼铌酸锂晶体的光折变性能研究

生长了掺入不同浓度六价钼元素的铌酸锂晶体(LN∶Mo),并研究了它们在351 nm、488 nm、532 nm和671 nm处的光折变性能.实验结果表明0.5mol;为最佳掺杂量,此时LN∶Mo在各波段具有最快的响应速度和较好的饱和衍射效率.增加极化电流可以提高光折变性能,尤其当极化电流为145 mA时,掺杂量为0.5mol;的LN∶Mo晶体紫外光折变响应时间缩短至0.35 s.这些优异的全息存储性能归因于Mo6+占据了正常的Nb位.LN∶Mo晶体是实现全色全息存储的潜力材料.