Zhang Tianyang, Wang Xiao, Wu Zhenyu, Yang Tianyu, Zhao Han, Wang Jiawei, Huang Hui, Liu Yang, Kang Zhenhui
Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-based Functional Materials and Devices, Soochow University Suzhou 215123 China
Macao Institute of Materials Science and Engineering, Macau University of Science and Technology Taipa 999078 Macau SAR China.
Nanoscale Adv. 2021 Oct 4;3(24):6949-6955. doi: 10.1039/d1na00576f. eCollection 2021 Dec 7.
The manufacture of blue light-emitting diodes (LEDs) has always been a tough problem to solve in the display and illumination fields. Inorganic/organic semiconductors and carbon dots (CDs) with a wide band gap still face obstacles such as a low external quantum efficiency (EQE) and poor stability. Herein, we synthesized highly stable and blue emission CDs with a chemically inert surface, and the photoluminescence (PL) peak (in ultra-pure water) of which is located at 446 nm with an absolute PL quantum yield (PLQY) of 26.4%. The LEDs based blue emission CDs exhibit an electroluminescence (EL) peak located at 456 nm and a high brightness of 223 cd m with an EQE of 0.856%. The Commission Internationale del'Eclairage (CIE) coordinates are located at (0.21, 0.23) and the device lifetime with 65% brightness ( ) reaches over 217 h because of the chemically inert surface of the CDs. The results mean the devices are the most stable CDs-LEDs reported to date. This work represents a novel route for the preparation of low cost, highly stable and very bright CDs-LEDs with a short wavelength emission.
蓝光发光二极管（LED）的制造一直是显示和照明领域中一个难以解决的问题。具有宽带隙的无机/有机半导体和碳点（CD）仍然面临诸如外部量子效率（EQE）低和稳定性差等障碍。在此，我们合成了具有化学惰性表面的高稳定性蓝色发光CD，其光致发光（PL）峰（在超纯水中）位于446 nm处，绝对PL量子产率（PLQY）为26.4%。基于CD的蓝色发光LED表现出位于456 nm处的电致发光（EL）峰和223 cd m的高亮度，EQE为0.856%。国际照明委员会（CIE）坐标位于（0.21, 0.23），由于CD的化学惰性表面，亮度为65%时器件寿命超过217小时。结果表明这些器件是迄今为止报道的最稳定的CD-LED。这项工作为制备低成本、高稳定性且具有短波长发射的非常明亮的CD-LED提供了一条新途径。
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