Rounak Naphade, Augustin Caillas, Philippe Guyot Sionnest
{"title":"卤化铅处理后的HgSe/CdS量子点薄膜带内相对明亮的5 μm光致发光。","authors":"Rounak Naphade, Augustin Caillas, Philippe Guyot Sionnest","doi":"10.1021/acs.jpclett.5c01021","DOIUrl":null,"url":null,"abstract":"<p><p>The 5 μm intraband photoluminescence (PL) from 200 nm thin films of n-doped mercury selenide/cadmium sulfide (HgSe/CdS) core/shell colloidal quantum dots reaches 0.2% apparent external efficiency, after solid-state ligand exchange with a solution of lead iodide (PbI<sub>2</sub>) and annealing at 140 °C. The PbI<sub>2</sub> treatment removes 95% of the C-H vibration absorption, but the PL increase is correlated with improved n-doping and not with organic ligand removal. The integrated emission intensity increases only by 20% upon cooling from 423 to 85 K. This suggests that multiphonon relaxation is not limiting the PL and that brighter emission should still be possible. PbI<sub>2</sub> treatment gave the brightest films, but PbBr<sub>2</sub> and PbCl<sub>2</sub> have similar effects.</p>","PeriodicalId":62,"journal":{"name":"The Journal of Physical Chemistry Letters","volume":" ","pages":"5946-5951"},"PeriodicalIF":4.8000,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Relatively Bright Intraband 5 μm Photoluminescence from HgSe/CdS Quantum Dot Films after Lead Halide Treatment.\",\"authors\":\"Rounak Naphade, Augustin Caillas, Philippe Guyot Sionnest\",\"doi\":\"10.1021/acs.jpclett.5c01021\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><p>The 5 μm intraband photoluminescence (PL) from 200 nm thin films of n-doped mercury selenide/cadmium sulfide (HgSe/CdS) core/shell colloidal quantum dots reaches 0.2% apparent external efficiency, after solid-state ligand exchange with a solution of lead iodide (PbI<sub>2</sub>) and annealing at 140 °C. The PbI<sub>2</sub> treatment removes 95% of the C-H vibration absorption, but the PL increase is correlated with improved n-doping and not with organic ligand removal. The integrated emission intensity increases only by 20% upon cooling from 423 to 85 K. This suggests that multiphonon relaxation is not limiting the PL and that brighter emission should still be possible. PbI<sub>2</sub> treatment gave the brightest films, but PbBr<sub>2</sub> and PbCl<sub>2</sub> have similar effects.</p>\",\"PeriodicalId\":62,\"journal\":{\"name\":\"The Journal of Physical Chemistry Letters\",\"volume\":\" \",\"pages\":\"5946-5951\"},\"PeriodicalIF\":4.8000,\"publicationDate\":\"2025-06-19\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"The Journal of Physical Chemistry Letters\",\"FirstCategoryId\":\"1\",\"ListUrlMain\":\"https://doi.org/10.1021/acs.jpclett.5c01021\",\"RegionNum\":2,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"2025/6/6 0:00:00\",\"PubModel\":\"Epub\",\"JCR\":\"Q2\",\"JCRName\":\"CHEMISTRY, PHYSICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"The Journal of Physical Chemistry Letters","FirstCategoryId":"1","ListUrlMain":"https://doi.org/10.1021/acs.jpclett.5c01021","RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2025/6/6 0:00:00","PubModel":"Epub","JCR":"Q2","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
Relatively Bright Intraband 5 μm Photoluminescence from HgSe/CdS Quantum Dot Films after Lead Halide Treatment.
The 5 μm intraband photoluminescence (PL) from 200 nm thin films of n-doped mercury selenide/cadmium sulfide (HgSe/CdS) core/shell colloidal quantum dots reaches 0.2% apparent external efficiency, after solid-state ligand exchange with a solution of lead iodide (PbI2) and annealing at 140 °C. The PbI2 treatment removes 95% of the C-H vibration absorption, but the PL increase is correlated with improved n-doping and not with organic ligand removal. The integrated emission intensity increases only by 20% upon cooling from 423 to 85 K. This suggests that multiphonon relaxation is not limiting the PL and that brighter emission should still be possible. PbI2 treatment gave the brightest films, but PbBr2 and PbCl2 have similar effects.
期刊介绍：
The Journal of Physical Chemistry (JPC) Letters is devoted to reporting new and original experimental and theoretical basic research of interest to physical chemists, biophysical chemists, chemical physicists, physicists, material scientists, and engineers. An important criterion for acceptance is that the paper reports a significant scientific advance and/or physical insight such that rapid publication is essential. Two issues of JPC Letters are published each month.
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