Title:
CORE-SHELL QUANTUM DOT AND PREPARATION METHOD THEREFOR, AND ELECTROLUMINESCENT DEVICE CONTAINING SAME
Document Type and Number:
WIPO Patent Application WO/2019/153961
Kind Code:
A1
Abstract:
Provided are a core-shell quantum dot and a preparation method therefor, and an electroluminescent device containing same. The core of the core-shell quantum dot is CdSeXS(1-X), the shell layer of the quantum dot comprises a first and a second shell layer, the first shell layer is selected from one or more of ZnSe, ZnSeYS(1-Y) and Cd(Z)Zn(1-Z)S, and the second shell layer, which covers the first shell layer, is Cd(Z)Zn(1-Z) or ZnS; the maximum emission peak of the core-shell quantum dot is not more than 480 nm, and X, Y and Z are all greater than 0 and less than 1. Since the bandwidth of the CdSeXS(1-X) core is small, the HOMO energy level is shallow, which makes hole injection easy; the energy band of the first shell layer material is between the core and the second shell layer, which not only reduces the defects of the core and improves the photoluminescence efficiency of the quantum dot, but also reduces the potential injection barrier of a carrier and improves the external quantum efficiency and lifetime; and the second shell layer passivates the quantum dot and improves the overall stability.
Inventors:
HU BAOZHONG (CN)
LI GUANGXU (CN)
MAO YANHONG (CN)
GAO YUAN (CN)
SU YEHUA (CN)
LI GUANGXU (CN)
MAO YANHONG (CN)
GAO YUAN (CN)
SU YEHUA (CN)
Application Number:
PCT/CN2018/125322
Publication Date:
August 15, 2019
Filing Date:
December 29, 2018
Export Citation:
Assignee:
NAJING TECH CORP LTD (CN)
International Classes:
B82Y20/00; C09K11/88; B82Y40/00; C09K11/02; H01L51/50; H01L51/54
Foreign References:
| CN108251117A | 2018-07-06 | |||
| CN105802629A | 2016-07-27 | |||
| CN106497546A | 2017-03-15 | |||
| CN107230745A | 2017-10-03 | |||
| US20170005226A1 | 2017-01-05 |
Other References:
ZHAO, BINGXIA ET AL.: "Intrinsic Quantum Dot Based White-light-emitting Diodes with a Layered Coating Structure for Reduced Reabsorption of Multiphase Phosphors", RSCADV ., vol. 4, no. 85, 10 September 2014 (2014-09-10), pages 45155 - 45158, XP055630471, ISSN: 2046-2069
Attorney, Agent or Firm:
KANGXIN PARTNERS,P.C. (CN)
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