发光二极管
荧光粉
材料科学
光电子学
荧光
红外线的
碳纤维
二极管
猝灭(荧光)
量子点
发光
制作
带隙
量子效率
光学
病理
复合材料
物理
复合数
替代医学
医学
作者
Bin Xu,Jie Li,Jing Zhang,Huiying Ning,Xiaoqi Fang,Jian Shen,Heng Zhou,Tianlong Jiang,Zhenhua Gao,Xiangeng Meng,Zifei Wang
标识
DOI:10.1002/advs.202205788
摘要
Developing solid-state luminescent materials with bright long-wavelength emissions is of considerable practical importance in light-emitting diodes (LEDs) but remains a formidable challenge. Here, a novel structure engineering strategy is reported to realize solid-state fluorescence (FL)-emitted carbon dots (CDs) from visible to near-infrared region. This is the first report of such an extended wavelength emission of self-quenching-resistant solid-state CDs. Notably, the quantum yields of these CDs are remarkably improved up to 67.7%, which is the highest value for solid-state CDs. The surface polymer chains of CDs can efficiently suppress the conjugated sp2 carbon cores from π-π stacking inducing aggregation caused FL quenching, and the redshift of FL emissions is attributed to narrowing bandgap caused by an enlarged sp2 carbon core. Using these CDs as conversion phosphors, the fabrication of white LEDs with adjustable correlated color temperatures of 1882-5019 K is achieved. Moreover, a plant growth LED device is assembled with a blue-LED chip and deep-red/near-infrared-emitted CDs. Compared with sunlight and white LEDs, the peanuts irradiated by plant growth LED lamp show higher growth efficiency in terms of branches and leaves. This work provides high-quality solid-state CD-based phosphors for LED lighting sources that are required for diverse optoelectronic applications.
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