Trapani Danilo, Macaluso Roberto, Crupi Isodiana, Mosca Mauro
Thin-Films Laboratory, Department of Engineering, University of Palermo, Viale delle Scienze, Bdg. 9, I-90129 Palermo, Italy.
Materials (Basel). 2022 Aug 8;15(15):5450. doi: 10.3390/ma15155450.
This paper reviews the state-of-the-art technologies, characterizations, materials (precursors and encapsulants), and challenges concerning multicolor and white light-emitting diodes (LEDs) based on carbon dots (CDs) as color converters. Herein, CDs are exploited to achieve emission in LEDs at wavelengths longer than the pump wavelength. White LEDs are typically obtained by pumping broad band visible-emitting CDs by an UV LED, or yellow-green-emitting CDs by a blue LED. The most important methods used to produce CDs, top-down and bottom-up, are described in detail, together with the process that allows one to embed the synthetized CDs on the surface of the pumping LEDs. Experimental results show that CDs are very promising ecofriendly candidates with the potential to replace phosphors in traditional color conversion LEDs. The future for these devices is bright, but several goals must still be achieved to reach full maturity.
本文综述了基于碳点（CDs）作为颜色转换器的多色和白色发光二极管（LEDs）的最新技术、表征、材料（前驱体和封装剂）以及面临的挑战。在此，CDs被用于在LEDs中实现波长比泵浦波长更长的发射。白色LEDs通常通过用紫外LED泵浦宽带可见发射CDs，或用蓝色LED泵浦黄绿发射CDs来获得。详细描述了用于生产CDs的最重要方法，即自上而下法和自下而上法，以及将合成的CDs嵌入泵浦LEDs表面的过程。实验结果表明，CDs是非常有前景的环保候选材料，有潜力取代传统颜色转换LEDs中的磷光体。这些器件的未来前景光明，但要达到完全成熟仍需实现几个目标。
