光子学报, 2017, 46 (9): 0916001, 网络出版: 2017-10-16
CdSxSe1-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 CdSxSe1-x/ZnS(core/shell) Quantum Dots and Photoluminescent Transmission of the Doped Fiber
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 CdSxSe1-x/ZnS quantum dots Absorption cross-section Photoluminescence spectrum Quantum dot doped fiber Transmission of the doped fiber
摘要
测量了不同组份比例x的CdSxSe1-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0.1~5 mg/mL的CdS0.4Se0.6 /ZnS量子点光纤,测量了不同掺杂浓度量子点光纤中473 nm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CdSxSe1-x/ZnS量子点增益型光电子器件.
Abstract
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, CdS0.4Se0.6/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 CdSxSe1-x/ZnS-QDs doped photoelectronic devices in the future.
程成, 黄媛, 姚建华. CdSxSe1-x/ZnS(核/壳)量子点的光谱截面及其掺杂光纤的传光特性[J]. 光子学报, 2017, 46(9): 0916001. CHENG Cheng, HUANG Yuan, YAO Jian-hua. Spectra Cross-sections of CdSxSe1-x/ZnS(core/shell) Quantum Dots and Photoluminescent Transmission of the Doped Fiber[J]. ACTA PHOTONICA SINICA, 2017, 46(9): 0916001.