红外技术, 2017, 39 (2): 125, 网络出版: 2017-03-29   

红外 PbX量子点光致发光特性研究

Research on Photoluminescence Characteristics of Infrared PbX Quantum Dots
作者单位
北京信息科技大学, 北京 100192
摘要
利用尺寸效应调节发光波长, PbX量子点可用于近红外波段的光致发光。实际应用中对其辐射荧光特性的检测与评估, 在设计器件、开发系统、提高量子点光致发光有效利用率等方面具有重要意义。本文对比分析了不同尺寸 PbX量子点在近红外波段的吸收、发射光谱, 并对 PbX胶质量子点制成薄膜后的光致发光光谱进行了检测分析。光谱对比显示, 量子点薄膜化后荧光辐射波长峰值会发生一定量的红移, 全波半宽也会增大。提出一种在实际应用中检测量子点光致发光的空间分布情况并估算其效率的方法, 同时利用该方法对两种 PbX量子点薄膜样品进行了检测分析。分析表明, 量子点薄膜样品的光致发光功率与探测器相对样品发光表面的角度位置有关, 可以反映出薄膜中量子点的分布; 两种被测样品近红外激光照射下的荧光功率转换效率分别可达 2.51%和 2.06%, 适于工程应用。
Abstract
Photoluminescence of PbX quantum dots can be used in near infrared region by adjusting the wavelength via size effect. The photoluminescence (PL) characteristics detection and assessment for quantum dots are quite important in designing device, developing systems and improving utilization of PL energy in applications. In this paper, the absorption and PL spectra for PbX quantum dots of different size are analyzed in near infrared region. The PL spectrum for a PbX quantum dots film is also detected. The comparison of PL spectra shows that red shift occurs when the quantum dots are made into film and the full width at half maximum also increases. A method for detecting the PL power distribution of quantum dots and estimating the efficiency is presented and used to analyze two PbX film samples. The experimental results show that the PL power of the quantum dots film varies with the relative position of the detector, which may reveal the distribution of the PbX quantum dots in the film. The PL conversion efficiency within near infrared region for the two film samples are 2.51% and 2.06% respectively, which is suitable for engineering applications.

耿蕊, 张玉江, 陈青山. 红外 PbX量子点光致发光特性研究[J]. 红外技术, 2017, 39(2): 125. GENG Rui, ZHANG Yujiang, CHEN Qingshan. Research on Photoluminescence Characteristics of Infrared PbX Quantum Dots[J]. Infrared Technology, 2017, 39(2): 125.

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