CdS_xSe_(1-x)/ZnS(核/壳)量子点的光谱截面及其掺杂光纤的传光特性  

Spectra Cross-sections of CdS_xSe_(1-x)/ZnS(core/shell) Quantum Dots and Photoluminescent Transmission of the Doped Fiber

作　　者：程成[1,2] 黄媛 姚建华 

机构地区：[1]浙江工业大学光电子智能化技术研究所,杭州310023 [2]浙江省高端激光制造装备协同创新中心,杭州310014

出　　处：《光子学报》2017年第9期1-8,共8页Acta Photonica Sinica

基　　金：国家自然科学基金(Nos.61274124;61474100)资助~~

摘　　要：测量了不同组份比例x的CdS_xSe_(1-x)/ZnS(核/壳)量子点的吸收谱和发射谱,确定了量子点的吸收系数、吸收截面和发射截面.量子点吸收截面随粒径的增大而增大、随x的增大而减小.采用紫外固化胶,制备了掺杂浓度为0.1~5mg/mL的CdS_(0.4)Se_(0.6)/ZnS量子点光纤,测量了不同掺杂浓度量子点光纤中473nm泵浦功率的吸收衰减速率.吸收衰减速率和吸收截面弱关联于掺杂浓度.测量了光致荧光光谱强度随光纤长度和量子点浓度的变化.量子点光纤的光致荧光峰值强度随掺杂浓度和光纤长度变化而变化,且存在一个与最大峰值强度对应的饱和掺杂浓度和光纤长度.本文的实验结果有助于进一步构建新型的CdS_xSe_(1-x)/ZnS量子点增益型光电子器件.The absorption coefficient,absorption and emission cross-sections of CdSxSe1-x/ZnS （core/shell） Quantum Dots （QDs） were determined by measuring absorption-emission spectra of the QDs with different composition ratio x.The absorption cross-section of QDs shows an increase with the increase of QD size,and shows a decrease with the x increase.In addition,CdS0.4 Se0.6/ZnS QDs doped fibers are prepared in a solid fiber core of ultraviolet gel in the doping concentration of 0.1 ～5 mg/mL.The absorption decay rate of 473 nm laser pumped into the QDs doped fiber are measured for different doping concentrations.There is evidence to show that the absorption-decay rate and the cross-section are weakly associated with the doping concentration,and the photoluminescence-peak intensity of the doped fiber varies with the fiber length and the doping concentration.There is a saturating doping concentration and desired fiber length corresponding to the maximum photoluminescent intensity.The experimental results provide a support for development of CdSx Se1-x/ZnS-QDs doped photoelectronic devices in the future.

关 键 词：CdSxSe1-x/ZnS量子点 吸收截面 光致荧光光谱 量子点掺杂光纤 量子点光纤传光特性 

分 类 号：O433.4[机械工程—光学工程]