PbSe量子点近红外光源的CH<sub>4</sub>气体检测

邢笑雪; 王宪伟; 秦宏伍; 商微微; 马玉静

doi:doi:10.3788/co.20181104.0662

中国光学, 2018, 11 (4): 662, 网络出版: 2018-07-30

PbSe量子点近红外光源的CH₄气体检测

CH₄ detection based on near-infrared luminescence of PbSe quantum dots

论文大纲

邢笑雪 ^*王宪伟秦宏伍商微微马玉静

作者单位

长春大学电子信息工程学院, 吉林长春 130012

CH4气体检测 PbSe量子点近红外发光 CH4 gas detection PbSe quantum dots near-infrared luminescence

摘要

研制了一种新型的PbSe量子点近红外光源，其光致发光谱较窄，能有效匹配气体的红外吸收峰。采用配位溶剂法合成出51 nm的PbSe量子点，并将其沉积到GaN芯片上(沉积厚度为1655 μm)，经过紫外光照处理和固化后制成了光致发光的近红外光源。该光源第一激子吸收峰位于1 592 nm，光致发光峰位于1 665 nm，其发射光谱包含了1 625~1 840 nm之间的CH4气体的全部的吸收谱。利用其进行CH4气体浓度检测实验，结果表明，系统的检测下限可以达到100×10-6，检测误差为2%。这种由PbSe量子点近红外光源构成的新型检测系统具有低功耗、低成本和高效能等优点，将其应用在气体检测中时可以略去滤光片，其在红外气体检测领域中有着较广阔的应用前景。

Abstract

In this paper, a new type of near-infrared light source of PbSe quantum dots(QDs) is introduced. Its photoluminescence(PL) spectrum is narrow which effectively match the infrared absorption peak of targets gases. The 51 nm PbSe quantum dots are synthesized by using the coordination solvent method and deposited on the GaN chip(with a deposition thickness of 1655 μm), then a photoluminescent near-infrared light source is fabricated after ultraviolet light treatment and curing. The first exciton absorption peak of the light source is located at 1 592 nm, the photoluminescence peak is located at 1 665 nm, and its emission spectrum contains the entire absorption spectrum of CH4 gas between 1 625-1 840 nm. The CH4 gas concentration detection experiment is carried out using this light source. The results show that the lowest detection limit of 100×10-6 and the detection error of 2% can be obtained. The new detection system composed of PbSe quantum dots near-infrared light source has the advantages of low power consumption, low cost and high efficiency. When it is used in gas detection, the filter can be omitted, and it has a broad application prospect in the field of infrared gas detection.

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邢笑雪, 王宪伟, 秦宏伍, 商微微, 马玉静. PbSe量子点近红外光源的CH₄气体检测[J]. 中国光学, 2018, 11(4): 662. XING Xiao-xue, WANG Xian-wei, QIN Hong-wu, SHANG Wei-wei, MA Yu-jing. CH₄ detection based on near-infrared luminescence of PbSe quantum dots[J]. Chinese Optics, 2018, 11(4): 662.

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