摘要：本课题通过熔融法在硅酸盐玻璃基底上（SiO2-Na2CO3-Bi2O3-Li2CO3）制备PbSe量子点和掺杂Er3+离子的PbSe量子点。通过实验来观察吸收光谱，从而探究出PbSe量子点的最佳析晶温度。随后在PbSe量子点中掺杂入Er3+离子，通过逐渐增加PbSe量子点的浓度，来探究在监测波长下，激发光子进入到体系内部以后，通过和稀土离子相互作用，增强了围绕局域稀土离子的光子的密度，使得可被光子吸收的泵浦光子的数目提高后，激发光谱增强，但是是否无限增强无法确定。通过观察激发光谱，探究随着PbSe量子点的引入量的增加， Er3+离子的吸收强度、峰型及位置没有改变。在不同波长的泵浦源下观察其发射光谱，探究下转移强度的变化，并探究最佳波长的泵浦源。以及观察近红外光谱，随着PbSe量子点含量的上升它的荧光强度的变化，探究达到最佳荧光强度的PbSe量子点的浓度。
关键词： PbSe量子点；熔融法；热处理条件；Er3+离子
Study on synthesis and spectral properties of PbSe Quantum Dots
Abstract:PbSe Quantum Dots and PbSe quantum points doped with ER3+ ions are prepared by melting method on silicate glass substrate (SiO2-Na2CO3-Bi2O3-Li2CO3) . The optimal crystallization temperature of pbse quantum dots was investigated by observing the Absorption Spectra by experiments. Then the PbSe quantum dots were doped with Er3+ Ions. The concentration of PbSe quantum dots was gradually increased to investigate the interaction with rare earth ions after the excitation of the photon into the system under the monitoring wavelength, the density of photons surrounding local rare earth ions has been enhanced, increasing the number of pumped photons that can be absorbed by photons, and enhancing the excitation spectrum, but it is impossible to determine whether or not infinite enhancement is possible. By obser-ving the excitation Spectra, the absorption intensity, the peak type and the position of Er3+ Ions remained unchanged with the increase of pbse quantum dots. The emission spectrum was observed at different wavelength sources, and the change of transfer intensity was studied. With the increase of PbSe quantum dot content, the fluorescence intensity of PbSe quantum dots reached the best fluorescence intensity was studied.
Keywords: PbSe quantum dots; melting method; Heat Treatment Condition; Er3+ Ion
目录
1绪论 1
1.1引言 1
1.2 半导体量子点的光学性质 1
1.2.1 量子尺寸效应 1
1.2.2 表面效应 2
1.2.3 量子限域效应 2
1.2.4 宏观量子隧道效应 2
1.2.5 库仑阻塞效应 3
1.2.6 量子点的发光模式 3
1.3 量子点的制备 4
1.3.1 溶胶-凝胶法 4
1.3.2熔融法 5
1.3.3 微溶液法 6
1.3.4 应变自组装法 6
1.3.5 分子束外延法 6
1.4 Er3+离子的光学性质 7
1.4.1 镧系元素的外层电子排布 8
1.4.2 Er3+离子的光学性质的调控 9
1.5本论文主要研究内容及意义 11
2实验与测试 12 PbSe量子点的合成及光谱性质研究:http://www.chuibin.com/wuli/lunwen_205431.html