Park Sunghee, Kim Young-Hoon, Kang Sungwoo, Lim Donggyu, Park Jinwoo, Jang Dawoon, Choi Seungjoo, Kim Jeongho, Han Seungwu, Lee Tae-Woo, Park Sungjin
Department of Chemistry and Chemical Engineering Inha University 100 Inha-ro, Michuhol-gu Incheon 22212 Republic of Korea.
Department of Materials Science and Engineering Seoul National University 1 Gwanak-ro, Gwanak-gu Seoul 08826 Republic of Korea.
Small Sci. 2021 Jan 15;1(2):2000042. doi: 10.1002/smsc.202000042. eCollection 2021 Feb.
Carbon nitrides (CN) show excellent properties in various optical and optoelectronic applications. However, their application to electroluminescence (EL) devices is limited by the lack of production methods of homogeneous dispersions in organic solvents, which are critically required for device fabrication. Herein, a strategy to generate stable dispersions of fluorescent, 2D CN materials, and demonstrate light-emitting diodes (LEDs) based on them is proposed. The treatment of urea-driven CN (UCN) with methoxy-benzene diazonium salt (MD) produces dispersions in organic solvents. Experimental and theoretical studies suggest that MD treatment passivates the surface defects of the UCN. The resulting LED devices show bright green luminescence with an external quantum efficiency of 0.91%. This unprecedented result opens an era of CN emitters as future promising light emitters in displays and solid-state lighting.
碳氮化物（CN）在各种光学和光电子应用中表现出优异的性能。然而，它们在电致发光（EL）器件中的应用受到在有机溶剂中缺乏均匀分散体生产方法的限制，而这对于器件制造至关重要。在此，提出了一种生成荧光二维CN材料稳定分散体并展示基于它们的发光二极管（LED）的策略。用甲氧基苯重氮盐（MD）处理尿素驱动的CN（UCN）可在有机溶剂中产生分散体。实验和理论研究表明，MD处理钝化了UCN的表面缺陷。所得的LED器件显示出明亮的绿色发光，外部量子效率为0.91%。这一前所未有的结果开启了CN发射体作为显示器和固态照明未来有前景的发光体的时代。
