One-Pot Synthesis of Orange Emissive Carbon Quantum Dots for All-Type High Color Rendering Index White Light-Emitting Diodes

作     者：Guo, Huazhang Liu, Zhikang Shen, Xiaoyu Wang, Liang 

作者机构：Shanghai Univ Sch Environm & Chem Engn Inst Nanochem & Nanobiol Shanghai 200444 Peoples R China 

出 版 物：《ACS SUSTAINABLE CHEMISTRY & ENGINEERING》 (ACS Sustainable Chem. Eng.)

年 卷 期：2022年第10卷第26期

页      面：8289-8296页

核心收录：

学科分类：0817[工学-化学工程与技术] 08[工学] 0703[理学-化学] 

基　　金：National Natural Science Foundation of China [21901154, 21671129] Shanghai Pujiang Program [21PJD022] 

主　　题：carbon quantum dots orange molecular fusion method color rendering index WLEDs 

摘      要：The challenges of toxicity and stability of traditional long-wavelength emitting luminescent materials undoubtedly restrain their widespread applications. Some remedial proposals do not fundamentally solve these problems. So, the development of new types of long-wavelength emitting luminescent materials has become a new trend. Herein, orange emissive carbon quantum dots (O-CQDs) are successfully prepared by a simple one-step solvothermal approach using 1-amino-2-naphthol hydrochloride and citric acid (CA). Interestingly, O-CQDs can always be achieved by the regulation of different reaction conditions (e.g., CA concentration, temperature, and reaction times), which is closely related to the fixed structure of O-CQDs inherited from the used precursor. An O-CQD displays its homogeneous size distribution with an average size of 2.5 nm and obtains a high-graphitoid sp(2) hybrid architecture. Impressively, O-CQDs exhibit remarkable photoluminescent (PL) properties, including excitation-independent behavior, thermostability, photostability, and the robust non-solvatochromic effect, in different solvents due to their efficient pi-conjugated system. These excellent properties lay the optical foundation of O-CQDs for the construction of high-performance white-light-emitting diode (WLED) devices. More importantly, O-CQDs are employed as a light regulator combined with yellow emissive CQDs to form the phosphor, and then CQD phosphor-based all-type WLEDs with a high color rendering index (CRI, = 81) are realized. This work provides a new avenue for the exploration of low-cost, environment-friendly, and high-performance CQD phosphor-based all-type WLEDs using long-wavelength emitting CQDs as a light regulator.