Chang, HJ Lu, CZ Wang, YS Son, CS Kim, SI Kim, YH Choi, IH 2024-01-21T06:14:07Z 2024-01-21T06:14:07Z 2021-09-05 2004-10 0374-4884 https://pubs.kist.re.kr/handle/201004/137201 ZnO nanocrystals were synthesized by using a sol-gel method and their optical properties were investigated as functions of the ZnO nanoparticle size. The photoluminescence spectrum showed two peaks: one was an ultraviolet (UV) exciton emission at around 363 nm, and the other was a visible emission at around 500 nm that originated from deep-band traps. As the particle size was increased, the intensity of the visible emission decreased, while that of the UV emission increased. Both the UV and the visible emissions shifted to a lower energy with increasing particle size. The band-edge emission exhibited a red-shift in relation to the absorption edge due to the Stokes shift. Exciton emission was observed at a slightly red-shifted wavelength with an energy of 180 meV in respect to the absorption onset, as observed in other II-VI semiconductor nanocrystals. English KOREAN PHYSICAL SOC ROOM-TEMPERATURE ZINC-OXIDE THIN-FILMS DEPOSITION EMISSION GROWTH COLLOIDS Optical properties of ZnO nanocrystals synthesized by using sol-gel method Article 1 JOURNAL OF THE KOREAN PHYSICAL SOCIETY, v.45, no.4, pp.959 - 962 JOURNAL OF THE KOREAN PHYSICAL SOCIETY 45 4 959 962 scie scopus kci 000224537900031 2-s2.0-8644240323 Physics, Multidisciplinary Physics Article ROOM-TEMPERATURE ZINC-OXIDE THIN-FILMS DEPOSITION EMISSION GROWTH COLLOIDS ZnO sol-gel nanocrystals photoluminescence