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文章主要研究了CdSe量子点微腔结构,微腔结构包括上下分布式布拉格反射镜(DBR),中间的有源层为溶解在聚甲基丙烯酸甲酯(PMMA)中的CdSe胶体量子点.采用传递矩阵法模拟微腔的反射光谱,对实验测试曲线进行较好的拟合.通过测试微腔结构的光致荧光(PL)光谱,其半峰宽(FWHM)由未加入微腔的CdSe量子点样品的27.9nm,减小到微腔结构的7.5nm,在微腔中的量子点,由于腔模式的出现,其发光谱的品质因数增加了3.6倍,达到了荧光增强的效果.
In this paper, we mainly study the structure of CdSe quantum dots microcavity, including the up-down distributed Bragg reflector (DBR) and the active layer in the middle as CdSe colloid quantum dots dissolved in polymethylmethacrylate (PMMA) The transfer matrix method was used to simulate the reflectance spectra of the microcavities, and the experimental curves were fitted well. By measuring the PL spectra of the microcavities, the FWHM of the microcavities was determined by the addition of CdSe quantum 27.9 nm of the sample is reduced to 7.5 nm in the microcavity structure. The quantum dots in the microcavity have a 3.6-fold increase in the quality factor of the emission spectrum due to the cavity mode, achieving the effect of enhancing the fluorescence.