荔枝壳掺氮源合成用于LED下转换的碳量子点OA北大核心
Nitrogen-doped carbon dots synthesized from lychee exocarp for LED down-conversion applications
碳量子点(carbon dots,CDs)常用作发光二极管(light-emitting diode,LED)显示屏的颜色转换材料,然而由于CDs对水、氧气和化学试剂的耐受性低,在LED下转换涂层中的应用常受到限制.以荔枝壳为碳源,采用水热合成法制备CDs,并通过添加尿素、氨水和三聚氰胺掺杂氮元素,以调节CDs的发光颜色.使用水溶性聚乙烯醇(polyvinyl alcohol,PVA)作为CDs的固相分散基质,获得具有良好荧光性和生物相容性的CDs-PVA薄膜.通过透射电子显微镜、荧光光谱等方法对CDs的形貌、结构和物理化学性质进行研究.结果表明,制备出的CDs在紫外光激发下产生了多色荧光,表现出优异的光稳定性,并具有较高的绝对量子产率,最高可达7.20%.研究结果可为LED下转换提供潜在的应用价值.
Carbon dots(CDs)materials are commonly used as color conversion materials for light-emitting diode(LED)display.However,their poor resistance to water,oxygen and chemical reagents limits their applications in LED down-conversion coatings.To facilitate further processing and enhance their application,it is essential to encapsulate CDs with a solid substrate to preserve the original optical properties of CDs.In this study,lychee exocarp was used as the carbon source to prepare CDs via a solvothermal method.The as-synthesized CDs were deliberately doped with various nitrogen sources,including urea,ammonia and melamine(MA),to regulate the color emission behavior of CDs.Additionally,a widely-used water-soluble polyvinyl alcohol(PVA)was applied serving as the solid phase dispersion matrix for the CDs,resulting in CDs/PVA films with excellent fluorescence and biocompatibility.The morphological,structural,and physicochemical properties of the nitrogen-doped CDs were systematically investigated using transmission electron microscopy(TEM),fluorescence(FL)spectrum,and other methods.The synthesized CDs exhibit multi-color fluorescence upon UV excitationand demonstrate outstanding photostability.The absolute quantum yield of the CDs is relatively high,reaching up to 7.20%.This research results suggest that the synthesized CDs have potential applications in LED down-conversion.
李安宇;巩婧伟;张齐艳;黄双武
深圳大学材料学院,广东 深圳 518060深圳大学电子与信息工程学院,广东 深圳 518060深圳大学材料学院,广东 深圳 518060||深圳大学电子与信息工程学院,广东 深圳 518060||深圳大学微电子研究所,广东 深圳 518060||深圳大学广东省功能材料界面工程研究中心,广东 深圳 518060||深圳大学射频异质异构集成全国重点实验室,广东 深圳 518060深圳大学材料学院,广东 深圳 518060||深圳大学电子与信息工程学院,广东 深圳 518060||深圳大学微电子研究所,广东 深圳 518060||深圳大学广东省功能材料界面工程研究中心,广东 深圳 518060||深圳大学射频异质异构集成全国重点实验室,广东 深圳 518060
荧光材料氮掺杂碳量子点LED下转换荔枝壳聚乙烯醇量子产率水热合成法
fluorescent materialnitrogen doped carbon dotsLED down-conversionlychee exocarppolyvinyl alcoholquantum yieldsolvothermal method
《深圳大学学报（理工版）》 2025 (2)
146-153,8
National Natural Science Foundation of China(52203096)Shenzhen Science and Technology Program(RCBS20221008093110036,ZDSYS20220527171402005) 国家自然科学基金资助项目(52203096)深圳市科技计划资助项目(RCBS20221008093110036,ZDSYS20220527 171402005)
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