Quantum dot light-emitting diodes(QLEDs)have become an important research direction in the pursuit of next-generation display technology owing to their favorable attributes,including high energy efficiency,wide color ...Quantum dot light-emitting diodes(QLEDs)have become an important research direction in the pursuit of next-generation display technology owing to their favorable attributes,including high energy efficiency,wide color gamut,and low cost.Breakthroughs in the luminous efficiency and operating life of QLEDs have been achieved by enhancing the photoluminescence efficiency of the quantum dots(QDs)and optimizing the device structure.However,the current mainstream QDs contain heavy metal elements such as lead and cadmium,which restrict the development and application of QD displays.Exploring new types of environmentally friendly QDs is crucial.I-III-VI semiconductor QDs have been developed as luminescent materials for constructing high color rendering index QLEDs,owing to the outstanding photophysical properties of these QDs,such as composition-dependent tunable bandgap,large Stokes shift,and highefficiency luminescence.Currently,the microstructures of heterojunctions,especially the surface states and interface states,affect the recombination and transport of carriers in electroluminescent(EL)devices with multilayer thin film structures,which in turn influence the luminous efficiency and stability of the device.This review focuses on the synthesis strategies of I-III-VI multi-component QDs and provides an in-depth understanding of the luminescence mechanism and the regulation of photophysical and electronic properties.Furthermore,the application of I-III-VI QDs in multi-color and white EL QLEDs is discussed and the challenges and outlook are addressed.展开更多
目的HPLC法测定不同产地多茎重楼Paris polyphylla Smith var. yunnanensis根茎中重楼皂苷Ⅶ、H、Ⅵ、Ⅱ、Ⅲ、Ⅰ、Ⅴ的含量,建立其HPLC指纹图谱,并与滇重楼根茎对照药材HPLC指纹图谱进行比较分析。方法采用Thermore C18色谱柱(250mm...目的HPLC法测定不同产地多茎重楼Paris polyphylla Smith var. yunnanensis根茎中重楼皂苷Ⅶ、H、Ⅵ、Ⅱ、Ⅲ、Ⅰ、Ⅴ的含量,建立其HPLC指纹图谱,并与滇重楼根茎对照药材HPLC指纹图谱进行比较分析。方法采用Thermore C18色谱柱(250mm×4.6mm,5μm);流动相为水-乙腈,梯度洗脱,检测波长203 nm;柱温30℃;体积流量1 mL/min;进样量10μL,外标法与一测多评法同时对不同产地多茎重楼根茎中重楼皂苷Ⅶ、H、Ⅵ、Ⅱ、Ⅲ、Ⅰ、Ⅴ的含量进行测定,采用单因素方差分析法对含量差异进行分析;建立多茎重楼根茎HPLC指纹图谱,并与滇重楼根茎对照药材HPLC指纹图谱进行比较分析。结果不同产地多茎重楼根茎重楼皂苷Ⅶ、H、Ⅵ、Ⅱ、Ⅲ、Ⅰ、Ⅴ的含量测定结果表明,在线性范围内线性关系良好(r>0.9997),平均加样回收率为98.34%~99.34%,RSD≤1.00%;不同产地多茎重楼根茎中重楼皂苷Ⅶ、H、Ⅵ、Ⅱ、Ⅲ、Ⅰ、Ⅴ的含量存在显著(P<0.05)或极显著(P<0.01)差异,重楼皂苷(Ⅰ+Ⅱ+Ⅵ+Ⅶ)总量在1.239%~6.236%,显著高于《中国药典》规定的重楼药材质量控制标准的0.60%,且外标法与一测多评法测定结果无显著性差异。HPLC指纹图谱相似度评价结果表明,不同产地多茎重楼和滇重楼对照药材根茎中共有12个共有指纹特征峰,二者HPLC指纹图谱相似度较高。结论该方法操作简单、准确、重复性好,可用于多茎重楼根茎中重楼皂苷Ⅶ、H、Ⅵ、Ⅱ、Ⅲ、Ⅰ、Ⅴ的含量测定;不同产地多茎重楼根茎中重楼皂苷(Ⅰ+Ⅱ+Ⅵ+Ⅶ)总含量较高,不同产地多茎重楼与滇重楼对照药材根茎HPLC指纹图谱相似度较高。展开更多
基金financially supported by the Science and Technology Project of Hebei Education Department(QN2021122)the Natural Science Foundation of Hebei Province(F2022408002)+1 种基金the Science Research Start-up Funding of Langfang Normal University(XBQ202305)the National Natural Science Foundation of China(51902054)。
文摘Quantum dot light-emitting diodes(QLEDs)have become an important research direction in the pursuit of next-generation display technology owing to their favorable attributes,including high energy efficiency,wide color gamut,and low cost.Breakthroughs in the luminous efficiency and operating life of QLEDs have been achieved by enhancing the photoluminescence efficiency of the quantum dots(QDs)and optimizing the device structure.However,the current mainstream QDs contain heavy metal elements such as lead and cadmium,which restrict the development and application of QD displays.Exploring new types of environmentally friendly QDs is crucial.I-III-VI semiconductor QDs have been developed as luminescent materials for constructing high color rendering index QLEDs,owing to the outstanding photophysical properties of these QDs,such as composition-dependent tunable bandgap,large Stokes shift,and highefficiency luminescence.Currently,the microstructures of heterojunctions,especially the surface states and interface states,affect the recombination and transport of carriers in electroluminescent(EL)devices with multilayer thin film structures,which in turn influence the luminous efficiency and stability of the device.This review focuses on the synthesis strategies of I-III-VI multi-component QDs and provides an in-depth understanding of the luminescence mechanism and the regulation of photophysical and electronic properties.Furthermore,the application of I-III-VI QDs in multi-color and white EL QLEDs is discussed and the challenges and outlook are addressed.
文摘目的HPLC法测定不同产地多茎重楼Paris polyphylla Smith var. yunnanensis根茎中重楼皂苷Ⅶ、H、Ⅵ、Ⅱ、Ⅲ、Ⅰ、Ⅴ的含量,建立其HPLC指纹图谱,并与滇重楼根茎对照药材HPLC指纹图谱进行比较分析。方法采用Thermore C18色谱柱(250mm×4.6mm,5μm);流动相为水-乙腈,梯度洗脱,检测波长203 nm;柱温30℃;体积流量1 mL/min;进样量10μL,外标法与一测多评法同时对不同产地多茎重楼根茎中重楼皂苷Ⅶ、H、Ⅵ、Ⅱ、Ⅲ、Ⅰ、Ⅴ的含量进行测定,采用单因素方差分析法对含量差异进行分析;建立多茎重楼根茎HPLC指纹图谱,并与滇重楼根茎对照药材HPLC指纹图谱进行比较分析。结果不同产地多茎重楼根茎重楼皂苷Ⅶ、H、Ⅵ、Ⅱ、Ⅲ、Ⅰ、Ⅴ的含量测定结果表明,在线性范围内线性关系良好(r>0.9997),平均加样回收率为98.34%~99.34%,RSD≤1.00%;不同产地多茎重楼根茎中重楼皂苷Ⅶ、H、Ⅵ、Ⅱ、Ⅲ、Ⅰ、Ⅴ的含量存在显著(P<0.05)或极显著(P<0.01)差异,重楼皂苷(Ⅰ+Ⅱ+Ⅵ+Ⅶ)总量在1.239%~6.236%,显著高于《中国药典》规定的重楼药材质量控制标准的0.60%,且外标法与一测多评法测定结果无显著性差异。HPLC指纹图谱相似度评价结果表明,不同产地多茎重楼和滇重楼对照药材根茎中共有12个共有指纹特征峰,二者HPLC指纹图谱相似度较高。结论该方法操作简单、准确、重复性好,可用于多茎重楼根茎中重楼皂苷Ⅶ、H、Ⅵ、Ⅱ、Ⅲ、Ⅰ、Ⅴ的含量测定;不同产地多茎重楼根茎中重楼皂苷(Ⅰ+Ⅱ+Ⅵ+Ⅶ)总含量较高,不同产地多茎重楼与滇重楼对照药材根茎HPLC指纹图谱相似度较高。
