Wang Zhibin, Jiang Naizhong, Liu Menglong, Zhang Ruidan, Huang Feng, Chen Daqin
College of Physics and Energy, Fujian Normal University, Fujian Provincial Collaborative Innovation Center for Advanced High-Field Superconducting Materials and Engineering, Fuzhou, 350117, China.
College of Physics and Energy, Fujian Normal University, Fujian Provincial Engineering Technology Research Center of Solar Energy Conversion and Energy Storage, Fuzhou, 350117, China.
Small. 2021 Dec;17(52):e2104551. doi: 10.1002/smll.202104551. Epub 2021 Nov 2.
Carbon dots (CDs) as one of the most promising carbon-based nanomaterials are inspiring extensive research in optoelectronic applications. White-light-emitting diodes (WLEDs) with tunable correlated color temperatures (CCTs) are crucial for applications in white lighting. However, the development of high-performance CDs-based electroluminescent WLEDs, especially those with adjustable CCTs, remains a challenge. Herein, white CDs-LEDs with CCTs from 2863 to 11 240 K are successfully demonstrated by utilizing aggregation-induced emission red-shifting and broadening of CDs. As a result, a series of warm white, pure white, and cold white CDs-LEDs are realized with adjustable emissions in sequence along the blackbody radiation curve. These CDs-LEDs reach maximum brightness and external quantum efficiency up to 1414-4917 cd m and 0.08-0.87%, respectively, which is among the best performances of white CDs-LEDs. To the best of the authors' knowledge, this is the first time that CCT-tunable white electroluminescent CDs-LEDs are demonstrated through controlling the aggregation degrees of CDs.
碳点（CDs）作为最具潜力的碳基纳米材料之一，正激发着人们在光电应用领域进行广泛研究。具有可调相关色温（CCT）的白光发光二极管（WLEDs）对于白光照明应用至关重要。然而，开发高性能的基于碳点的电致发光WLEDs，尤其是那些具有可调CCT的器件，仍然是一项挑战。在此，通过利用碳点的聚集诱导发射红移和展宽，成功展示了CCT范围从2863到11240 K的白色碳点发光二极管。结果，沿着黑体辐射曲线依次实现了一系列具有可调发射的暖白色、纯白色和冷白色碳点发光二极管。这些碳点发光二极管的最大亮度和外量子效率分别达到1414 - 4917 cd/m²和0.08 - 0.87%，这是白色碳点发光二极管的最佳性能之一。据作者所知，这是首次通过控制碳点的聚集程度来展示CCT可调的白色电致发光碳点发光二极管。
