Quantum confinement effect and photoenhancement of photoluminescence of PbS and PbS/MnS quantum dots
The quantum confinement effect and photoenhancement of photoluminescence (PL) of lead sulphide (PbS) quantum dots (QDs) and lead sulphide/manganese sulphide (PbS/MnS) core shell QDs capped with thiol ligands in aqueous solution were investigated. From PL results, the presence of MnS shells gives a s...
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Multidisciplinary Digital Publishing Institute
2020
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| Online Access: | http://psasir.upm.edu.my/id/eprint/87385/ |
| _version_ | 1848860430895677440 |
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| author | Zaini, Muhammad Safwan Josephine Ying, Chyi Liew Alang Ahmad, Shahrul Ainliah Mohmad, Abdul Rahman Ahmad Kamarudin, Mazliana |
| author_facet | Zaini, Muhammad Safwan Josephine Ying, Chyi Liew Alang Ahmad, Shahrul Ainliah Mohmad, Abdul Rahman Ahmad Kamarudin, Mazliana |
| author_sort | Zaini, Muhammad Safwan |
| building | UPM Institutional Repository |
| collection | Online Access |
| description | The quantum confinement effect and photoenhancement of photoluminescence (PL) of lead sulphide (PbS) quantum dots (QDs) and lead sulphide/manganese sulphide (PbS/MnS) core shell QDs capped with thiol ligands in aqueous solution were investigated. From PL results, the presence of MnS shells gives a strong confinement effect which translates to higher emission energy in PbS/MnS core shell QDs. Increasing MnS shell thickness from 0.3 to 1.5 monolayers (ML) causes a blueshift of PL peak energies as the charge carriers concentrated in the PbS core region. Enhancement of the PL intensity of colloidal PbS and PbS/MnS core shell QDs has been observed when the samples are illuminated above the band gap energy, under continuous irradiation for 40 min. Luminescence from PbS QDs and PbS/MnS core shell QDs can be strongly influenced by the interaction of water molecules and oxygen present in aqueous solution adsorbed on the QD surface. However, PbS/MnS core shell QDs with a shell thickness of 1.5 ML did not show a PL peak energy stability as it was redshifted after 25 min, probably due to wider size distribution of the QDs. |
| first_indexed | 2025-11-15T12:45:07Z |
| format | Article |
| id | upm-87385 |
| institution | Universiti Putra Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-15T12:45:07Z |
| publishDate | 2020 |
| publisher | Multidisciplinary Digital Publishing Institute |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | upm-873852024-05-27T07:38:48Z http://psasir.upm.edu.my/id/eprint/87385/ Quantum confinement effect and photoenhancement of photoluminescence of PbS and PbS/MnS quantum dots Zaini, Muhammad Safwan Josephine Ying, Chyi Liew Alang Ahmad, Shahrul Ainliah Mohmad, Abdul Rahman Ahmad Kamarudin, Mazliana The quantum confinement effect and photoenhancement of photoluminescence (PL) of lead sulphide (PbS) quantum dots (QDs) and lead sulphide/manganese sulphide (PbS/MnS) core shell QDs capped with thiol ligands in aqueous solution were investigated. From PL results, the presence of MnS shells gives a strong confinement effect which translates to higher emission energy in PbS/MnS core shell QDs. Increasing MnS shell thickness from 0.3 to 1.5 monolayers (ML) causes a blueshift of PL peak energies as the charge carriers concentrated in the PbS core region. Enhancement of the PL intensity of colloidal PbS and PbS/MnS core shell QDs has been observed when the samples are illuminated above the band gap energy, under continuous irradiation for 40 min. Luminescence from PbS QDs and PbS/MnS core shell QDs can be strongly influenced by the interaction of water molecules and oxygen present in aqueous solution adsorbed on the QD surface. However, PbS/MnS core shell QDs with a shell thickness of 1.5 ML did not show a PL peak energy stability as it was redshifted after 25 min, probably due to wider size distribution of the QDs. Multidisciplinary Digital Publishing Institute 2020 Article PeerReviewed Zaini, Muhammad Safwan and Josephine Ying, Chyi Liew and Alang Ahmad, Shahrul Ainliah and Mohmad, Abdul Rahman and Ahmad Kamarudin, Mazliana (2020) Quantum confinement effect and photoenhancement of photoluminescence of PbS and PbS/MnS quantum dots. Applied Sciences, 10 (18). art. no. 6282. pp. 1-10. ISSN 2076-3417 https://www.mdpi.com/2076-3417/10/18/6282 10.3390/app10186282 |
| spellingShingle | Zaini, Muhammad Safwan Josephine Ying, Chyi Liew Alang Ahmad, Shahrul Ainliah Mohmad, Abdul Rahman Ahmad Kamarudin, Mazliana Quantum confinement effect and photoenhancement of photoluminescence of PbS and PbS/MnS quantum dots |
| title | Quantum confinement effect and photoenhancement of photoluminescence of PbS and PbS/MnS quantum dots |
| title_full | Quantum confinement effect and photoenhancement of photoluminescence of PbS and PbS/MnS quantum dots |
| title_fullStr | Quantum confinement effect and photoenhancement of photoluminescence of PbS and PbS/MnS quantum dots |
| title_full_unstemmed | Quantum confinement effect and photoenhancement of photoluminescence of PbS and PbS/MnS quantum dots |
| title_short | Quantum confinement effect and photoenhancement of photoluminescence of PbS and PbS/MnS quantum dots |
| title_sort | quantum confinement effect and photoenhancement of photoluminescence of pbs and pbs/mns quantum dots |
| url | http://psasir.upm.edu.my/id/eprint/87385/ http://psasir.upm.edu.my/id/eprint/87385/ http://psasir.upm.edu.my/id/eprint/87385/ |