Synthesis and characterization of CdSe quantum dots of phosphine-free colloidal method under various conditions

10^th International Conference and Exhibition on Lasers, Optics & Photonics

November 26-28, 2018 | Los Angeles, USA

Hye Mi Cho, Nu Si A Eom and Bum Sung Kim

Korea Institute for Rare Metal, Republic of Korea

Posters & Accepted Abstracts: J Laser Opt Photonics

Abstract :

Recently, quantum dots have been investigated as promising optoelectronic materials because of its unique optoelectronic properties and high stability compared with bulk material by quantum confinement effect. Quantum dots have been studied to solve the limitations of commotional optoelectronic device. For example, the luminescence wavelength can be shifted to a visible wavelength range with quantum dots. Therefore, quantum dots optoelectronics can be applied into not only biochemical applications but also light emitting diodes (LEDs), laser and fluorescent biological label. The composite semiconductor nanocrystals such as CdS, CdSe and ZnSe have been studied for photoluminescent quantum dots materials. Above all, CdSe is advantageous materials because it has bright luminescence in the visible range of the optical spectrum and easily fabricable in well-dispersed nano-sized crystals. The properties of CdSe quantum dots core such as reaction temperature, concentrations and time can be varied using the synthetic parameters. The most of cases, CdSe quantum dots were synthesized by a colloidal process with phosphine (PH3) precursor such as TOP, TOPO and TBP. However, conventional colloidal methods with PH3 were suitable, hazardous and pollutive. In this study, quantum dots are successfully synthesized using phosphine-free colloidal method under various conditions is confirmed to control surface properties. In order to evaluate the size dependence of CdSe crystal, synthesis temperatures were changed from 2400C to 3000C and precursor ratio (Cd:Se) was controlled. The optical properties of the synthesized CdSe quantum dots were confirmed using photoluminescence (PL). The microstructure and phase developments were measured by transmission electron microscopy (TEM) and X-ray diffractometer (XRD) respectively.

Biography :

Hye Mi Cho had a BS in Materials Engineering and a Master of Ceramic Engineering degree. So, as a structural analysis expert, I am doing analysis work to help research.

E-mail: heymee@kitech.re.kr