用于器件应用的E7液晶中Cu和gd掺杂ZnO纳米复合材料的可调谐介电、电光和光致发光特性

IF 4.2 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Optical Materials Pub Date : 2025-09-29 DOI:10.1016/j.optmat.2025.117568

Gülnur Önsal, Umit Hüseyin Kaynar

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引用次数: 0

摘要

本研究研究了Cu和gd掺杂ZnO纳米颗粒对向列E7液晶基质结构、介电、电光和光致发光（PL）性能的影响。采用微波辅助凝胶燃烧法合成纳米颗粒，并将其均匀分散到E7中。介电测量显示，两种掺杂剂的介电常数和介电强度都有所降低，其中Gd:ZnO产生的效果更为明显。电光分析表明，阈值电压从0.78 V（纯E7）降至0.71 V (Gd:ZnO/E7)，表明开关特性得到改善。PL研究表明，在掺杂样品中，特别是Gd:ZnO，由于深阱态和非辐射复合而显着猝灭。此外，所有掺杂结构在增加的电场下都表现出电压诱导的PL猝灭。这些发现表明，Cu:ZnO和Gd:ZnO掺杂lc具有可调谐的介电和光学响应，是低功耗显示器件、光调制器和可调谐光电系统的有希望的候选者。

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Tunable dielectric, electro-optic, and photoluminescence properties of Cu- and Gd-doped ZnO nanocomposites in E7 liquid crystals for device applications

This study investigates the effects of Cu- and Gd-doped ZnO nanoparticles on the structural, dielectric, electro-optical, and photoluminescence (PL) properties of a nematic E7 liquid crystal matrix. Nanoparticles were synthesized using a microwave-assisted gel combustion method and uniformly dispersed into E7. Dielectric measurements revealed a reduction in permittivity and dielectric strength with both dopants, with Gd:ZnO producing a more pronounced effect. Electro-optical analysis showed that the threshold voltage decreased from 0.78 V (pure E7) to 0.71 V (Gd:ZnO/E7), indicating improved switching characteristics. PL studies demonstrated significant quenching in doped samples, particularly with Gd:ZnO, attributed to deep trap states and non-radiative recombination. Additionally, all doped structures exhibited voltage-induced PL quenching under increasing electric fields. These findings suggest that Cu:ZnO and Gd:ZnO doped LCs offer tunable dielectric and optical responses and are promising candidates for low-power display devices, light modulators, and tunable optoelectronic systems.

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来源期刊

Optical Materials 工程技术-材料科学：综合

CiteScore

6.60

自引率

12.80%

发文量

1265

审稿时长

38 days

期刊介绍： Optical Materials has an open access mirror journal Optical Materials: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. The purpose of Optical Materials is to provide a means of communication and technology transfer between researchers who are interested in materials for potential device applications. The journal publishes original papers and review articles on the design, synthesis, characterisation and applications of optical materials. OPTICAL MATERIALS focuses on: • Optical Properties of Material Systems; • The Materials Aspects of Optical Phenomena; • The Materials Aspects of Devices and Applications. Authors can submit separate research elements describing their data to Data in Brief and methods to Methods X.