Cadmium-free blue-emitting quantum dots with gradient alloyed core-shell structure： realizing high-performance emission via synergistic band engineering and surface passivation

WEI Jiangliu; XIE Yingying; CHEN Jiefeng; JIN Lei; ZHANG Zhikuan

doi:10.3724/CJLCD.2026-0097

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Cadmium-free blue-emitting quantum dots with gradient alloyed core-shell structure： realizing high-performance emission via synergistic band engineering and surface passivation

Material Physics | 更新时间：2026-09-16

- Cadmium-free blue-emitting quantum dots with gradient alloyed core-shell structure： realizing high-performance emission via synergistic band engineering and surface passivation
- Chinese Journal of Liquid Crystals and Displays Vol. 41, Issue 8, Pages: 1073-1085(2026)
- 作者机构：
  
  深圳扑浪创新科技有限公司，广东深圳 518115
- 作者简介：
- 基金信息：
- DOI：10.3724/CJLCD.2026-0097
  CLC： O482.31
- CSTR：32172.14.CJLCD.2026-0097
- Received：01 June 2026，
  
  Revised：2026-07-10，
  
  Published：05 August 2026
- 稿件说明：
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WEI Jiangliu, XIE Yingying, CHEN Jiefeng, et al. Cadmium-free blue-emitting quantum dots with gradient alloyed core-shell structure： realizing high-performance emission via synergistic band engineering and surface passivation[J]. Chinese Journal of Liquid Crystals and Displays, 2026, 41(8): 1073-1085.
DOI：

WEI Jiangliu, XIE Yingying, CHEN Jiefeng, et al. Cadmium-free blue-emitting quantum dots with gradient alloyed core-shell structure： realizing high-performance emission via synergistic band engineering and surface passivation[J]. Chinese Journal of Liquid Crystals and Displays, 2026, 41(8): 1073-1085. DOI： 10.3724/CJLCD.2026-0097. CSTR： 32172.14.CJLCD.2026-0097.

摘要

蓝光量子点是无镉环保显示与健康照明领域的关键发光材料，然而，其面临色纯度不足（半峰宽FWHM

30 nm）、发光效率偏低（光致发光量子产率PLQY

75%）、空气稳定性差及合成工艺繁琐等关键瓶颈。本研究提出一种协同能带工程与表面钝化的创新策略，通过精准构筑ZnSeTe/ZnSe/ZnSeS/ZnS梯度组分核壳结构，并结合卤化物辅助生长，成功制备了高性能无镉蓝光量子点。4层梯度结构实现了从核到外壳的晶格常数平滑过渡，有效抑制了界面失配缺陷；同时，卤素离子（Cl

）在生长过程中选择性吸附于高能晶面，调控生长动力学以促进粒径均一化，并与表面不饱和Zn²⁺配位，钝化悬挂键。所制备量子点发射波长为460 nm，半峰宽收窄至18 nm，光致发光量子产率高达92%，且空气中放置60天后PLQY保留率

80%。该协同策略为开发环保型高性能量子点提供了普适性思路。

Abstract

Blue-emitting quantum dots（QDs） serve as core luminescent materials for cadmium-free， environmentally benign display and healthy

lighting technologies. However， their practical application is hindered by critical challenges， including inadequate color purity（full width at half-maximum， FWHM

30 nm）， low luminescence efficiency（photoluminescence quantum yield， PLQY

75%）， poor ambient air stability， and cumbersome synthetic protocols. To address these bottlenecks， this study proposes an innovative synergistic strategy integrating band engineering and surface passivation. Through the precise construction of a ZnSeTe/ZnSe/ZnSeS/ZnS gradient-composition core-shell structure coupled with halide-assisted growth， high-performance cadmium-free blue-emitting QDs were successfully synthesized. The four-layer gradient core-shell architecture enables a smooth transition of lattice constants from the core to the outer shell， thereby effectively suppressing interfacial mismatch defects and reducing non-radiative recombination losses. Meanwhile， halide ions （Cl

） selectively adsorb onto high-energy crystal facets during the crystal growth process， which not only regulates the growth kinetics to enhance particle size uniformity but also coordinates with surface unsaturated Zn

ions to passivate surface dangling bonds， further optimizing the photoluminescent properties of the QDs. The as-synthesized QDs exhibit an emission wavelength of 460 nm， a narrow FWHM as low as 18 nm， and a high PLQY of up to 92%. Notably， the PLQY retention rate remains above 80% even after 60 days of storage under ambient air， demonstrating excellent long-term stability. This synergistic strategy provides a universal and scalable design principle for the development of environmentally friendly， high-performance quantum dot materials for advanced optoelectronic applications.

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Related Author

WEI Jiangliu

XIE Yingying

CHEN Jiefeng

JIN Lei

ZHANG Zhikuan

ZENG Zhicong

Yue ZHAO

Xu-peng GAO

Related Institution

College of Electronic Science and Engineering, Jilin University

Key Laboratory for Special Functional Materials of Ministry of Education National， School of Nanoscience and Materials Engineering， Henan University

Key Laboratory of Luminescence and Optical Information Ministry of Education， School of Physical Science and Engineering， Beijing Jiaotong University

School of Physical Science and Engineering， Beijing Jiaotong University

Anhui Zhongyi New Material Technology Co. Ltd.

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