量子点转化LED封装的进展与展望

发布时间：2018-11-11 22:10

【摘要】：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.
[Abstract]:Quantum Dot conversion Light-emitting Diode (quantum dots converted light-emitting diode,QCLED) is a novel light-emitting device which encapsulates quantum dots in light-emitting diode (LED). The advantages of narrow half-peak width and high quantum yield enable QCLED to obtain the light with high display, high saturation and wide color gamut, which has become a hot research and application in the field of lighting and backlight in recent years. Unlike conventional phosphors, quantum dots can only survive in liquid or solid substrates. The most commonly used packaging form is to blend with polymers to form films and then encapsulate in LED. However, the following four key problems are involved in the packaging process: (1) compatibility problems will be encountered in the blending process of quantum dots and polymers, which will lead to poor film formation rate, quantum dot agglomeration, fluorescence quenching of quantum dots, and so on; (2) the thermal reliability of QCLED is poor, and the increase of temperature will lead to the fall off or failure of the QDs' surface matching experience, which will expose the surface defects and lead to the decrease of the reversible or irreversible fluorescence efficiency; (3) the reliability of oxygen and wet gas is poor, oxygen and moisture will permeate the surface of quantum dots in the film, and react irreversibly with the ligand or surface atoms, resulting in the degradation of the optical effect of the film; (4) the composition spectrum of QCLED is usually three or four, and it needs more than two kinds of quantum dots to be mixed and encapsulated. In order to meet the goals of high explicit finger and high light efficiency, it is necessary to optimize the combination of optical parameters and components of each component spectrum. The purpose of this paper is to provide theoretical guidance for practical packaging and to obtain high performance QCLED.. In this review, the above problems are discussed, and the corresponding solutions are summarized, and the spectral optimization methods of high performance QCLED are summarized and prospected.
【作者单位】：华中科技大学能源与动力工程学院热封装实验室;
【基金】：国家自然科学基金(51576078,51376070) 国家重点基础研究发展计划(2011CB013105)资助
【分类号】：TN312.8

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