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深圳扑浪创新科技有限公司, 广东 深圳 518115
韦江流,男,学士,2011年于五邑大学获得学士学位,主要从事半导体纳米晶的合成设计与光电转换器件材料方面的研究。E-mail:weijl@planckinnovation. com
金磊,女,博士,副研究员,2019年于加拿大国立科学研究院(Institut National de la Recherche Scientifique,INRS)获得博士学位,主要从事半导体纳米晶的合成设计与光电转换器件的开发,致力于推动绿色能源技术与高效光电器件的创新。E-mail:jinl@planckinnovation. com
张志宽,男,博士,高级工程师,2005年于香港科技大学获得博士学位,主要从事半导体量子点发光材料及其在新型显示技术中的应用研究。E-mail:zhangzk@planckinnovation.com
收稿:2026-06-01,
修回:2026-07-10,
纸质出版:2026-08-05
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韦江流, 谢莹莹, 陈结峰, 等. 梯度合金核壳结构无镉蓝光量子点:协同能带工程与表面钝化实现高性能发射[J]. 液晶与显示, 2026,41(8):1073-1085.
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.
韦江流, 谢莹莹, 陈结峰, 等. 梯度合金核壳结构无镉蓝光量子点:协同能带工程与表面钝化实现高性能发射[J]. 液晶与显示, 2026,41(8):1073-1085. DOI: 10.3724/CJLCD.2026-0097. CSTR: 32172.14.CJLCD.2026-0097.
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.
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。
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
2+
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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