Light-Driven Quantum Dot Dialogues: Oscillatory Photoluminescence in Langmuir–Blodgett Films
This study explores the optical properties of a close-packed monolayer composed of core/shell-alloyed CdSeS/ZnS quantum dots (QDs) of two different sizes and compositions. The monolayers were self-assembled in a stacked configuration at the water/air interface using Langmuir–Blodgett (LB) techniques...
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MDPI AG
2025-07-01
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| Online Access: | https://www.mdpi.com/2079-4991/15/14/1113 |
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| author | Tefera Entele Tesema |
| author_facet | Tefera Entele Tesema |
| author_sort | Tefera Entele Tesema |
| collection | DOAJ |
| description | This study explores the optical properties of a close-packed monolayer composed of core/shell-alloyed CdSeS/ZnS quantum dots (QDs) of two different sizes and compositions. The monolayers were self-assembled in a stacked configuration at the water/air interface using Langmuir–Blodgett (LB) techniques. Under continuous 532 nm laser illumination on the red absorption edge of the blue-emitting smaller QDs (QD450), the red-emitting larger QDs (QD645) exhibited oscillatory temporal dynamics in their photoluminescence (PL), characterized by a pronounced blueshift in the emission peak wavelength and an abrupt decrease in peak intensity. Conversely, excitation by a 405 nm laser on the blue absorption edge induced a drastic redshift in the emission wavelength over time. These significant shifts in emission spectra are attributed to photon- and anisotropic-strain-assisted interlayer atom transfer. The findings provide new insights into strain-driven atomic rearrangements and their impact on the photophysical behavior of QD systems. |
| format | Article |
| id | doaj-art-3dda1f9224bf485283581bb2a7c82850 |
| institution | DOAJ |
| issn | 2079-4991 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj-art-3dda1f9224bf485283581bb2a7c828502025-08-20T02:47:10ZengMDPI AGNanomaterials2079-49912025-07-011514111310.3390/nano15141113Light-Driven Quantum Dot Dialogues: Oscillatory Photoluminescence in Langmuir–Blodgett FilmsTefera Entele Tesema0Department of Chemistry, Prairie View A&M University, Prairie View, TX 77446, USAThis study explores the optical properties of a close-packed monolayer composed of core/shell-alloyed CdSeS/ZnS quantum dots (QDs) of two different sizes and compositions. The monolayers were self-assembled in a stacked configuration at the water/air interface using Langmuir–Blodgett (LB) techniques. Under continuous 532 nm laser illumination on the red absorption edge of the blue-emitting smaller QDs (QD450), the red-emitting larger QDs (QD645) exhibited oscillatory temporal dynamics in their photoluminescence (PL), characterized by a pronounced blueshift in the emission peak wavelength and an abrupt decrease in peak intensity. Conversely, excitation by a 405 nm laser on the blue absorption edge induced a drastic redshift in the emission wavelength over time. These significant shifts in emission spectra are attributed to photon- and anisotropic-strain-assisted interlayer atom transfer. The findings provide new insights into strain-driven atomic rearrangements and their impact on the photophysical behavior of QD systems.https://www.mdpi.com/2079-4991/15/14/1113quantum dots (QDs)Langmuir–Blodgett filmsPLinterdot coupling effectsoscillatory PL dynamicsinterlayer atom transfer |
| spellingShingle | Tefera Entele Tesema Light-Driven Quantum Dot Dialogues: Oscillatory Photoluminescence in Langmuir–Blodgett Films Nanomaterials quantum dots (QDs) Langmuir–Blodgett films PL interdot coupling effects oscillatory PL dynamics interlayer atom transfer |
| title | Light-Driven Quantum Dot Dialogues: Oscillatory Photoluminescence in Langmuir–Blodgett Films |
| title_full | Light-Driven Quantum Dot Dialogues: Oscillatory Photoluminescence in Langmuir–Blodgett Films |
| title_fullStr | Light-Driven Quantum Dot Dialogues: Oscillatory Photoluminescence in Langmuir–Blodgett Films |
| title_full_unstemmed | Light-Driven Quantum Dot Dialogues: Oscillatory Photoluminescence in Langmuir–Blodgett Films |
| title_short | Light-Driven Quantum Dot Dialogues: Oscillatory Photoluminescence in Langmuir–Blodgett Films |
| title_sort | light driven quantum dot dialogues oscillatory photoluminescence in langmuir blodgett films |
| topic | quantum dots (QDs) Langmuir–Blodgett films PL interdot coupling effects oscillatory PL dynamics interlayer atom transfer |
| url | https://www.mdpi.com/2079-4991/15/14/1113 |
| work_keys_str_mv | AT teferaenteletesema lightdrivenquantumdotdialoguesoscillatoryphotoluminescenceinlangmuirblodgettfilms |