Ren Junkai, Liu Jiong, Wei Bing, Zhang Wenfei, Edman Ludvig, Wang Jia
The Organic Photonics and Electronics Group, Department of Physics, Umeå University, Umeå SE-90187, Sweden.
School of Physics, Xidian University, Xi'an 710071, China.
ACS Appl Nano Mater. 2025 Jan 30;8(5):2472-2480. doi: 10.1021/acsanm.4c06734. eCollection 2025 Feb 7.
Deep-blue (DB) emitters that feature high photoluminescence quantum yield (PLQY) and narrow spectral bandwidth are desired for a variety of optoelectronic applications, particularly for lighting, illumination, and lasing. Currently favored DB emitters constitute quantum dots comprising cadmium or lead and organic compounds derived from petroleum, but they suffer from toxicity and sustainability issues. Here, we report the solvothermal synthesis of DB-emitting carbon dots (s) using bioderivable phloroglucinol as the sole starting material, which exhibit a peak emission wavelength of 403 nm, narrow spectral full width at half-maximum of 35 nm, and high PLQY of 61% in ethanol. The s with a planar structure are demonstrated to comprise distinct graphene segments in a polyether-cross-link network, with the former functioning as the fluorophore. The application merit of the s is exemplified by their implementation as the gain medium in a random laser device, which exhibits a threshold optical power density of 40.5 kW cm. This study thus demonstrates a path toward efficient and sustainable deep-blue emitters, which can be exploited in practical applications.
具有高光致发光量子产率（PLQY）和窄光谱带宽的深蓝色（DB）发光体在各种光电子应用中都备受青睐，特别是在照明、照明和激光领域。目前受青睐的DB发光体包括含镉或铅的量子点以及源自石油的有机化合物，但它们存在毒性和可持续性问题。在此，我们报告了以生物可衍生的间苯三酚作为唯一起始原料，通过溶剂热合成法制备发出DB光的碳点，其在乙醇中的峰值发射波长为403 nm，半高宽窄至35 nm，PLQY高达61%。具有平面结构的这些碳点被证明在聚醚交联网络中包含不同的石墨烯片段，前者充当荧光团。这些碳点的应用价值体现在它们作为随机激光器件的增益介质，该器件的阈值光功率密度为40.5 kW/cm²。因此，本研究展示了一条通往高效且可持续的深蓝色发光体的途径，可在实际应用中加以利用。
