论文部分内容阅读
量子点转化发光二极管(quantum dots converted light-emitting diode,QCLED)是一种将量子点封装于发光二极管(LED)的新型发光器件,其中量子点作为一种新型的光转换材料,具有光谱可调、半峰宽较窄、量子产率高等优点,可以使QCLED获得高显指、高饱和性、宽色域的出光,成为近年来在照明和背光领域研究和应用的热潮.不同于传统荧光粉,量子点通常只能存活于液体或者固体基质中,其最常用的封装形式为与高聚物共混成膜,然后封装于LED中.但是在封装过程中如下4个关键问题:(1)量子点与高聚物的共混过程中会遇到兼容性问题,这将导致成膜合格率差、量子点团聚、量子点荧光猝灭等问题;(2)QCLED的热可靠性较差,温度升高将导致量子点表面配体会发生脱落或者失效,暴露出表面缺陷,造成可逆或不可逆的荧光效率降低;(3)氧气、湿气可靠性较差,氧气与湿气会渗透至膜片内的量子点表面,并与配体或表面原子发生不可逆反应,造成膜片的光学效果退化;(4)QCLED的组分光谱往往为3种或4种,需要有两种以上的量子点进行混合封装,为了满足高显指、高光效等目标,需要对各组分光谱的光学参数与组分之间的搭配进行优化,以期理论指导实际封装,获得高性能QCLED.本综述针对上述问题进行阐述,并对相应的解决方案进行了总结,对高性能QCLED的光谱优化方法进行了总结与展望.
Quantum dot converted light-emitting diode (QCLED) is a new type of light-emitting device that encapsulates quantum dots in a light-emitting diode (LED). Quantum dots, as a new light conversion material, , Narrow half-width, high quantum yield, QCLED can get high index, high saturation, wide color gamut of light, lighting and backlighting in recent years has become the field of research and application of craze. Different from the traditional phosphor , The quantum dot can only usually survive in a liquid or solid matrix, and the most common packaging form is to blend with a polymer to form a film, and then encapsulated in an LED. However, in the packaging process, the following four key issues are as follows: (1) Quantum In the blending process of point and polymer, compatibility problems will be encountered, which will lead to problems such as poor pass rate of film forming, aggregation of quantum dots, fluorescence quenching of quantum dots, etc .; (2) poor thermal reliability of QCLED, Increasing will result in the quantum dot surface ligand will fall off or failure, exposing the surface defects, resulting in reversible or irreversible fluorescence reduction; (3) oxygen, moisture less reliable, oxygen and moisture will penetrate into the membrane The amount of Point surface, and the ligand or surface atoms irreversible reaction, resulting in deterioration of the optical effect of the diaphragm; (4) QCLED component spectrum is often three or four, need more than two kinds of quantum dots mixed packaging, In order to meet the requirements of high apparent index and high optical efficiency, the optical parameters of each component should be optimized with the components in order to theoretically guide the actual package to obtain high-performance QCLED. This review addresses the above issues and Summarized the corresponding solutions, the high-performance QCLED spectral optimization methods were summarized and prospects.