Strongly photoluminescent CdTe nanocrystals by proper surface modification

Article Abstract:

The enhancement of the fluorescence quantum yield of CdTe nanocrystals by surface modification has been studied. CdTe nanocrystals have been prepared in aqueous solution by reacting Cd2+ with NaHTe and thioglycolic acid. The clusters start to crystallize and exhibit a narrow band of emission under reflux conditions. It has been observed that a shell of cadmium thioglycolic acid is formed around the CdTe core. The maximum quantum yield at room temperature has been measured to be 18% when the pH value of the CdTe solution is 4.5 by using thioglycolic acid.

Measurement, Crystals, Spectra, Thin films, Optical properties, Photoluminescence

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A novel organometallic synthesis of highly luminescent CdTe nanocrystals

Article Abstract:

Dimethyl cadmium is reacted with different tellurium sources in mixtures of dodecylamine and trioctylphosphine, which acts as the coordinating agent and size-regulating solvent, in order to synthesize highly luminescent CdTe nanocrystals. Results show that very narrow particle size distributions are obtained when hot injections are not used for separating nucleation and growth of the particles and at room temperature a photoluminescence quantum yield of upto sixty-five percent is observed.

Primary nonferrous metals, not elsewhere classified, Primary Smelting and Refining of Nonferrous Metal (except Copper and Aluminum), Cadmium, Tellurium, Electric properties

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One spot synthesis of highly luminescent CdSe/CdS core- shell nanocrystals via organometallic and "greener" chemical approaches

Article Abstract:

Different approaches to the synthesis of size series of highly luminescent CdSe/CdS core- shell nanocrystals are presented. Findings state that injecting H2S gas at 140 degree Celcius into the crude solution of CdSe nanocrystals and unreacted cadmium acetate results in formation of epitaxial CdS shells around CdSe cores.

Nanotechnology, Chemical properties

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