Preparation method of high-efficiency stable blue light perovskite quantum dot light-emitting diode

By dynamically controlling the concentration of ligand solution, stirring time, and reaction time, the problem of insufficient yield of blue perovskite quantum dots was solved, and efficient and stable preparation of blue light-emitting diodes was achieved, meeting the requirements of quantum optical performance and avoiding resource waste.

CN122373659APending Publication Date: 2026-07-10HENAN ACAD OF SCI INST OF APPLIED PHYSICS CO LTD +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HENAN ACAD OF SCI INST OF APPLIED PHYSICS CO LTD
Filing Date
2026-04-03
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

In existing technologies, the yield of blue perovskite quantum dots has not reached expectations, resulting in insufficient luminescence intensity and failing to meet the quantum optical performance requirements of high-efficiency and stable blue light-emitting diodes.

Method used

By gradually adjusting the concentration of the ligand solution, mixing the precursor solution and the dispersion solvent, and combining fluorescence emission spectrum data and the detection of the full width at half maximum (FWHM), the stirring time and reaction time are dynamically controlled to ensure that the emission peak position, size uniformity and yield of the blue perovskite quantum dots meet the preset requirements. This allows for the preparation of efficient and stable blue perovskite quantum dot luminescent films and the assembly of light-emitting diodes.

Benefits of technology

This approach enables comprehensive assessment and optimization of the fabrication process even when the yield of blue perovskite quantum dots does not meet expectations. This ensures the performance stability and efficiency of light-emitting diodes, avoids resource waste, and improves the fabrication efficiency and quality of blue perovskite quantum dot light-emitting diodes.

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Abstract

This invention relates to the field of quantum optical diode technology, and more particularly to a method for preparing a high-efficiency and stable blue perovskite quantum dot light-emitting diode (LED). The method includes mixing a ligand solution with an initial ligand concentration, a precursor solution with a preset concentration, and a dispersion solvent; adjusting the stirring time in response to a half-width at half-maximum (HWHM) value determined from the fluorescence emission spectrum data being greater than a preset HWHM value; and determining that the LED preparation is complete according to subsequent preparation processes based on a second yield value of the fluorescence quantum dots determined from the fluorescence emission spectrum data being less than a preset second yield value, and a dynamic evaluation standard being greater than a preset evaluation standard. This invention enables a comprehensive assessment of the quality of the prepared blue perovskite quantum dots even when the blue perovskite quantum dot yield is not as expected, resulting in insufficient luminous intensity. This ensures that the LED meets quantum optical performance requirements while fully utilizing the blue perovskite quantum dots.
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