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oe1(光电查) - 科学论文

3 条数据
?? 中文（中国） ▾

  • Influence of photoactivation on luminescent properties of colloidal InP@ZnS quantum dots

    摘要： The use of photo- and thermoactivation during the liquid-phase synthesis of colloidal quantum dots was found to yield luminescing InP@ZnS quantum dots with a luminescence quantum yield close to unity. Activation mode was found to have little or no influence on the maximal luminescent efficiency but affect particle size distribution. Compared to thermal activation, photoactivation ensures the formation of more monodispersed particles.

    关键词： Colloidal quantum dots,Thermoactivation,Indium phosphide,Luminescence quantum yield,Photoactivation

    更新于2025-09-23 15:19:57

  • Photostimulated control of luminescence quantum yield for colloidal Ag <sub/>2</sub> S/2-MPA quantum dots

    摘要： In this paper, we present the results on photoinduced formation of colloidal Ag2S quantum dots with sizes of 1.5–3 nm passivated by 2-mercaptopropionic acid (Ag2S/2-MPA) in the presence of ethylene glycol. The synthetized colloidal Ag2S/2-MPA QDs have NIR recombination luminescence with its maximum near 800 nm. The control of absorption and luminescence properties of the QDs is achieved by photoactivation. It is shown that photoexposure of colloidal solution of Ag2S/2-MPA QDs leads to an increase in the QD size and monodispersity along side with the growth of the luminescence quantum yield from 1% to 7.9%. Enhancement of the luminescence quantum yield is accompanied by an increase in the average luminescence lifetime up to 190 ns, which is due to the blocking of the nonradiative recombination channel with the radiative recombination rate being (3–5.5) × 105 s?1. It is shown that the purification of the Ag2S/2-MPA solution by a dialysis membrane from regenerated cellulose leads to an increase in the sample monodispersity, as well as stops the photoinduced growth of QDs, and also reduces the degradation of their photoluminescence.

    关键词： Ag2S quantum dots,NIR luminescence,2-mercaptopropionic acid,luminescence quantum yield,photoactivation

    更新于2025-09-16 10:30:52

  • Spectral-Luminescent Properties of 2-(2,6-Difluorophenyl)-5-phenyl-[2-acetyl(benzoyl)oxyphenyl]-1,3,4-oxadiazoles

    摘要： 2-(2,6-Difluorophenyl)-5-phenyl(2-hydroxyphenyl)-1,3,4-oxadiazoles were synthesized by cyclization of N-(2,6-difluorobenzoil) derivatives of benzohydazide or salicylhydrazide in thionyl chloride. When acylating 2-[5-(2,6-difluorophenyl)-1,3,4-oxadiazole-2-yl]phenol by acetyl or benzoyl chloride corresponding acetate and benzoate were obtained. Spectral-luminescent properties of the synthesized compounds were studied.

    关键词： 2,5-diaryl-1,3,4-oxadiazoles,organic luminophors,luminescence,luminescence quantum yield

    更新于2025-09-09 09:28:46