Title :
Room and Low temperature photoluminescence properties of CdSe quantum dots synthesized rapidly in aqueous approach
Author :
An, Wenyu ; Yi, Lie ; Liu, Chunxia ; Wenyu An ; Zhang, Yanhua
Author_Institution :
Center for Coll. Phys. Exp., Heilongjiang Univ., Harbin, China
Abstract :
Thiol-capped CdSe quantum dots are synthesized rapidly in aqueous solution assisted by microwave irradiation without any poisonous materials. Room and low temperature photoluminescence is employed to investigate the excitonic emission from thiol-capped CdSe quantum dots between 83K and 293 K. The photoluminescence peak position of CdSe quantum dots shift to shorter wavelengths and the photoluminescence intensity first enhance and then quench with decrease of temperature. The temperature dependence of the PL spectra is demonstrated through thermal escape and thermal rectification of surface trap states.
Keywords :
II-VI semiconductors; cadmium compounds; excitons; photoluminescence; quenching (thermal); semiconductor quantum dots; CdSe; aqueous approach; aqueous solution; excitonic emission; low temperature photoluminescence; microwave irradiation; photoluminescence intensity; quenching; room temperature photoluminescence; surface trap states; temperature 83 K to 298 K; thermal escape; thermal rectification; thiol-capped quantum dots; Films; Microwave measurements; Quantum dots; Quantum mechanics; Tellurium; Temperature measurement; Xenon; CdSe; Low temperature; Photoluminescence; Quantum dots;
Conference_Titel :
Electronics and Optoelectronics (ICEOE), 2011 International Conference on
Conference_Location :
Dalian
Print_ISBN :
978-1-61284-275-2
DOI :
10.1109/ICEOE.2011.6013212
