变色有机电致发光器件的研究进展

Progress in the Study of Color Tunable Organic Light Emitting Diode

碳基有机半导体光电器件易于从分子层级进行调控设计,近年来有机电致发光器件已逐步实现产业化。变色有机电致发光器件是指在单个或单种器件内实现多个色彩或色温变化的发光器件,使得单个像素点结构实现色彩或色温可调的功能,从而简化单个显示单元,是一种高分辨率的显示技术。依据变色原理的不同,变色有机电致发光器件分为器件结构变色、单发光层材料变色、外加驱动方式3个类别。对该领域最新研究进展、性能优势和发展现状进行了综述,进而探讨了变色有机电致发光器件存在的问题和发展趋势,拓展了研究思路,对推动变色有机电致发光器件的发展与应用具有指导作用。

Carbon-based organic semiconductor optoelectronic devices are easy to modulate from the molecular level design;organic electroluminescent devices have been gradually industrialized in recent years.Color tunable organic light emitting diodes(CT-OLEDs)are defined as the OLEDs realizing tuning color or color temperature in single device.CT-OLEDs effectively simplified structures of OLEDs with function of tuning color or color temperature applying in single pixel of display screen or lighting appliances.In this review article,we summarize that there are mainly three approaches to design and fabricate CT-OLEDs by novel device structures,novel luminescent materials and charging driving mode.Firstly,novel device structures of CT-OLEDs include complementary color connected in one OLED,Fabry-Perot cavity structure and optical grating structure.Secondly,the principle of CT-OLEDs using novel luminescent materials is that one layer of novel material emits light of different wavelengths from different energy states of one material,or mixed emitting materials as one layer emit light of different wavelengths from different energy states of different materials,or different treatment processes change the energy states of material in CT-OLEDs.Thirdly,CT-OLEDs realize tuning color or color temperature by charging driving electrical direction or frequency.Generally,CT-OLEDs show a great potential in applying in novel display and lighting in the future.