The effect of ultraviolet irradiation on the photothermal, photoluminescence and photoluminescence excitation spectra of Mn-doped ZnS nanoparticles

Autor:	Taro Toyoda, Almira B. Cruz, Qing Shen
Rok vydání:	2006
Předmět:	Potential well Photoluminescence Chemistry Doping Metals and Alloys Analytical chemistry Surfaces and Interfaces Nanocrystalline material Surfaces Coatings and Films Electronic Optical and Magnetic Materials Quantum dot Materials Chemistry Photoluminescence excitation Irradiation Luminescence
Zdroj:	Thin Solid Films. 499:104-109
ISSN:	0040-6090
DOI:	10.1016/j.tsf.2005.07.036
Popis:	Research involving Mn doped nanocrystalline ZnS (ZnS:Mn) has grown in recent years, partly due to the high quantum luminescence efficiencies that have been reported. We measured the photoacoustic (PA), the photoluminescence (PL) and the photoluminescence excitation (PLE) spectra of surface-passivated and unpassivated ZnS:Mn. The effects of UV irradiation on the PL and PLE spectra were also studied. A decrease in the PA intensity after UV exposure was observed for the ZnS:Mn, indicating a decrease in the nonradiative relaxation probability. The observed increase in PL intensity indicates a corresponding increase in the radiative transition probability. For the PLE spectra, possible aggregation of the primary particles could have resulted in the lower measured energy of the PLE peak compared to the value predicted by the effective mass approximation theory.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::3f95b94bef6e5c811d34aee72b37abd2 https://doi.org/10.1016/j.tsf.2005.07.036 Zobrazit plný text záznamu Full Text from ScienceDirect