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Interfused nanocrystals and method of preparing the same

a technology of nanocrystals and nanocrystals, which is applied in the direction of crystal growth process, polycrystalline material growth, luminescent compositions, etc., can solve the problems of disadvantageous over conventional techniques, and achieve the effect of superior material stability and excellent quantum efficiency

Inactive Publication Date: 2006-10-26
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0009] Accordingly, embodiments of the present invention have been made keeping in mind the above problems occurring in the related art, and an object of embodiments of the present invention is to provide nanocrystals having a novel structure that is able to exhibit excellent quantum efficiency in the blue light range and superior material stability.

Problems solved by technology

However, the above conventional techniques are disadvantageous because the preparation of core-shell nanocrystals emitting blue light requires a core crystal having a small size (a diameter of 2 nm or less), which becomes very unstable during the shell growth reaction and thus may aggregate.

Method used

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  • Interfused nanocrystals and method of preparing the same

Examples

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example 1

[0075] Synthesis Of CdSe Nanocrystal and Interfused CdSe / / ZnS

[0076] 16 g of trioctylamine (TOA), 0.3 g of octadecyl phosphonic acid, and 0.4 mmol cadmium oxide were simultaneously loaded into a 125 ml flask equipped with a reflux condenser, and then the temperature of the reaction mixture was maintained at 300° C. with stirring. Separately, a 2 M Se-TOP solution was prepared by dissolving Se powder in tioctylphosphine (TOP). 2 ml of the 2 M Se-TOP solution was rapidly added to the above stirred reaction mixture, and reacted for about 2 min. After completion of the reaction, the reaction mixture was cooled down to room temperature rapidly, and ethanol was added as a non-solvent. After centrifuging the obtained reaction solution, the supernatant of the solution was decanted, with the excepton of the centrifuged precipitate, and the precipitate was dispersed in toluene, to prepare a CdSe nanocrystal solution.

[0077] 8 g of TOA, 0.1 g of oleic acid, and 0.4 mmol zinc acetate were simul...

example 2

[0079] Effect of Reaction Temperature on Synthesis Of Interfused CdSe / / ZnS

[0080] 8 g of oleic acid, and 0.4 mmol zinc acetate were simultaneously loaded into a 125 ml flask equipped with a reflux condenser, and the temperature of the reaction mixture was maintained at each of 220, 260, 300 and 320° C. with stirring. Subsequently, the CdSe nanocrystal solution synthesized in Example 1 was added to the reaction mixture, and an S-TOP solution was slowly added thereto. The reaction was performed for about 1 hr. After completion of the reaction, the reaction mixture was cooled down to room temperature rapidly, and ethanol was added as a non-solvent. After centrifuging the obtained reaction solution, the supernatant of the solution was decanted, with the exception of the centrifuged precipitate, and the precipitate was dispersed in toluene, to prepare CdSe / / ZnS as interfused nanocrystals having a size of 5 nm.

[0081] The CdSe core had a maximum emission peak of 522 nm, and the interfused...

example 3

[0082] Effect of Reaction Time on Synthesis Of Interfused CdSe / / ZnS

[0083] 8 g of oleic acid, and 0.4 mmol zinc acetate were simultaneously loaded into a 125 ml flask equipped with a reflux condenser, and the temperature of the reaction mixture was maintained at 300° C. with stirring. Subsequently, the CdSe nanocrystal solution synthesized in Example 1 was added to the reaction mixture, and an S-TOP solution was slowly added thereto. The reaction was performed for each of 5 min, 20 min, 40 min, and 1 hr. After completion of the reaction, the reaction mixture was cooled down to room temperature rapidly, and ethanol was added as a non-solvent After centrifuged the obtained reaction solution, the supernatant of the solution was decanted, with the exception of the centrifuged precipitate, and the precipitate was dispersed in toluene, to prepare CdSe / / ZnS as interfused nanocrystals having a size of 5 nm.

[0084] The nanocrystals thus obtained emitted blue light under a 365 nm UV lamp. The...

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Abstract

Interfused nanocrystals including two or more materials, further including a n alloy layer formed of the two or more materials. In addition, a method of preparing the interfused nanocrystals. In the interfused nanocrystals, the alloy layer may be present at the interface between the two or more nanocrystals, thus increasing the material stability. A material having excellent quantum efficiency in the blue light range may be synthesized.

Description

CROSS-REFERENCE TO RELATED PATENT APPLICATION [0001] This application claims the benefit of Korean Patent Application Nos. 2004-91894 and 2005-79284, filed on Nov. 11, 2004 and Aug. 29, 2005, respectively, in the Korean Intellectual Property Office, the disclosures of which are incorporated herein in its entirety by reference. BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] Embodiments of the present invention relate, generally, to interfused nanocrystals and a method of preparing the same, and more particularly, to interfused nanocrystals comprising two or more materials, which further include a layer comprising an alloy of the above materials, and to a method of preparing the interfused nanocrystals. [0004] 2. Description of the Related Art [0005] In general, nanocrystals, which are materials having nano meter sized crystals, are composed of hundreds to thousands of atoms. As such, since the small sized material has a large surface area per unit volume a large ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C30B7/00C30B21/02C30B28/06H01L33/28
CPCB82Y20/00B82Y30/00C01B19/007C01P2002/84C01P2004/04C01P2004/64C30B7/005C01P2004/88C09K11/565H01L51/5012H01L51/5096H05B33/14C30B7/00C01P2004/80H10K50/115H10K50/11H10K50/18
Inventor JUN, SHIN AEJANG, EUN JOOCHOI, SEONG JAE
Owner SAMSUNG ELECTRONICS CO LTD
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