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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2015.1
- 수록면
- 7 - 12 (6page)
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In this work, photoluminescence (PL) properties of CdTe and CdTe@CdS core-shellquantum dots (QDs) were investigated. CdTe and CdTe@CdS QDs were synthesizedusing a microwave activated method. CdS shell grown using a microwave activatedmethod which was based on the heat sensitivity of Na2S2O3. X-ray diffraction (XRD)analysis demonstrated cubic crystalline structure for both of the synthesized QDs, butfor CdTe@CdS QDs, XRD diffraction peaks shifted to the longer angle. Sizes of CdTeand CdTe@CdS QDs were obtained as about 2.5 and 3.5 nm from transmission electronmicroscopy (TEM) images. UV-Vis and PL spectra showed that in this method both ofthe absorption and emission of CdTe QDs shifted from near blue to near red. By thegrowth of CdS shell around CdTe QDs, a red shift was observed in absorption and PLspectra. PL QY was obtained as about 23% and 38% for CdTe and CdTe@CdS core-shellQDs, respectively. Increase in the thickness of the CdS shell was possible only by the increase in the microwave irradiation timein the CdS shell growth step. Growth of the CdS shell around CdTe core, resulted in the red shift in band edge and PL spectra tothe longer wavelengths.
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