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Preparation and excitation power dependent photoluminescence of tetrapod-quantum wells
Nguyễn Thị Luyến, N. Lieu, Nguyen Thi Minh Hien, Le Duc Huy, Huy Quang Tran, Xuan Nghia Nguyen
Tetrapod-quantum wells (TWs) with CdSe core and quantum wells in gradient alloyed CdSeS arms were synthesized by one-pot colloidal method. The UV-Vis absorption, photoluminescence (PL), and excitation power dependent PL properties of TWs prepared …
Tetrapod-quantum wells (TWs) with CdSe core and quantum wells in gradient alloyed CdSeS arms were synthesized by one-pot colloidal method. The UV-Vis absorption, photoluminescence (PL), and excitation power dependent PL properties of TWs prepared within a 30-minute reaction time were investigated. Their PL spectrum exhibited two emission peaks centered at 2.187 eV and 2.207 eV due to radiative transitions within the core and quantum wells, respectively. Analysis of the excitation power dependent PL spectra showed that the core and quantum wells’ radiative recombination channels are independent up to the excitation power density of 2.29 × 102 mW/cm2. At higher power densities, efficient carrier transfer from the quantum wells into the cores occurred. This can be explained by the state filling of quantum wells and the decreasing band gap energy of gradient alloyed CdSeS arms towards the CdSe core.
Published in
Materials Research Express
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0 | 2024 |
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