PbSe量子点近红外光源的CH_4气体检测

CH_4 detection based on near-infrared luminescence of PbSe quantum dots

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Ga N芯片上(沉积厚度为165.5μm),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CH_4气体的全部的吸收谱。利用其进行CH_4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。

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 Ga N 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 quantumdots 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.