Blue-emitting nanocrystals with cubic shape and fluorine passivation

By forming nanostructures with a ZnSe core and ZnS/ZnF2 shells, the method addresses issues of ligand coverage and surface trap states, achieving high quantum yields and stability, suitable for applications in display devices and electroluminescent devices.

JP7716042B2Active Publication Date: 2025-07-31SHOEI CHEM IND CO LTD
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Patent Information

Application Number
JP2021574800
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Priority Date
2019-11-27
Filing Date
2020-07-10
Publication Date
2025-07-31
Estimated Expiration
2040-07-10

AI Technical Summary

Technical Problem

Existing methods for preparing semiconductor nanostructures face challenges in achieving high quantum yields, narrow emission peak widths, tunable emission wavelengths, and colloidal stability due to issues with ligand coverage and surface trap states, which affect photoluminescence quantum yield and compatibility with organic media.

Method used

The method involves forming nanostructures with a core comprising ZnSe or ZnSe1-xTex (0 < x < 1) and shells of ZnS and fluoride, such as ZnF2, to enhance ligand passivation and stability, using a process that includes mixing zinc and selenium sources with fluoride sources and leaching sulfur sources to form a ZnS shell.

Benefits of technology

The resulting nanostructures exhibit photoluminescence quantum yields of up to 99% and improved colloidal stability, with enhanced emission properties and reduced surface trap states.

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Abstract

The present disclosure relates to the field of nanotechnology. The present disclosure provides a method for preparing nanostructures by fluoride passivation. The present disclosure also provides a method for preparing nanostructures by fluoride and amine passivation. The nanostructures have high quantum yields, narrow emission peak widths, tunable emission wavelengths, and colloidal stability. Nanostructures prepared using the method are also provided. Nanostructure films and molded articles including the nanostructures are also provided.
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