Blue Lasing from Heavy-Metal-Free Colloidal Quantum Dots
|Corresponding Author||Li，Mingjie; Sun，Xiao Wei; Gao，Yuan|
Colloidal quantum dots (CQDs) have emerged as promising candidates for solution-processed optical gain materials. Despite the substantial progress made with Cd or Pb-contained CQDs, lasing from the environmentally friendly CQDs remains underexplored. Here, the highly emissive ZnSeTe/ZnSe/ZnS and ZnSe/ZnS CQDs is developed. The optical gain and lasing action from such Te-alloyed and intrinsic ZnSe/ZnS CQDs across the blue spectral region is achieved. Te-alloyed ZnSe core manifests a quasitype-II band alignment with the ZnSe intermediate layer, favorable for suppressing the Auger recombination and also lasing wavelength tuning. The transient absorption spectroscopy reveals evidence of a blue optical gain with a threshold of one exciton per dot and a lifetime of 171 ps in the alloyed CQDs. Under a quasicontinuous-wave pumping, lasing is observed from the blue CQDs in Fabry–Pérot cavities with a lower threshold fluence of 12.5 µJ cm as compared with the traditional counterparts with heavy metals. The demonstration of heavy-metal-free CQD lasing opens up new opportunities in the application of CQDs as efficient and environmental-friendly gain media.
[tsqn201909042] ;  ; [1-BE2Z] ; [1-CD5C] ; [R2021A064] ; 
|WOS Research Area|
Optics ; Physics
Optics ; Physics, Applied ; Physics, Condensed Matter
|WOS Accession No|
Cited Times [WOS]:1
|Document Type||Journal Article|
1.School of Information Sciences and Engineering,Shandong University,Qingdao,266237,China
2.Key Laboratory of Laser & Infrared System (Shandong University),Ministry of Education,Shandong University,Qingdao,266237,China
3.Department of Applied Physics,Photonics Research Institute,The Hong Kong Polytechnic University,Hong Kong
4.Key Laboratory of Energy Conversion and Storage Technologies (Southern University of Science and Technology),Ministry of Education,Shenzhen,518055,China
|Corresponding Author Affilication||Southern University of Science and Technology|
Wei，Huayu,Wei，Qi,Fang，Fan,et al. Blue Lasing from Heavy-Metal-Free Colloidal Quantum Dots[J]. Laser & Photonics Reviews,2022.
Wei，Huayu.,Wei，Qi.,Fang，Fan.,Xiang，Guohong.,Tong，Bingyi.,...&Gao，Yuan.(2022).Blue Lasing from Heavy-Metal-Free Colloidal Quantum Dots.Laser & Photonics Reviews.
Wei，Huayu,et al."Blue Lasing from Heavy-Metal-Free Colloidal Quantum Dots".Laser & Photonics Reviews (2022).
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