Ultra‐Broadband Random Laser and White‐Light Emissive Carbon Dots/Crystal In‐Situ Hybrids

• Published in: Small (Weinheim an der Bergstrasse, Germany) Germany), 2022-10, Vol.18 (41), p.e2203152-n/a
• Main Authors: Wang, Jingjing, Zhang, Shaofeng, Li, Yunfei, Wu, Cuiyu, Zhang, Wenfei, Zhang, Hailong, Xie, Zheng, Zhou, Shuyun
• Format: Article
• Language: English
• Subjects: Broadband; Carbon dots; Crystals; hybrid crystals; in‐situ preparation; Lasers; Light emission; Light sources; Nanosecond pulses; Nanotechnology; Near ultraviolet radiation; Pulsed lasers; ultra‐broadband random lasers; white‐light
• ISSN: 1613-6810; 1613-6829
• DOI: 10.1002/smll.202203152

The continuous white‐light emission of carbon dots (CDs) can be applied to producing multicolor laser emissions by one single medium. Meanwhile, the solid‐state emission greatly contributes to its practical application. In this work, a strategy to realize the in‐situ hybridization of silane‐functionalized CDs (SiCDs) and 1,3,5‐benzenetricarboxylic acid trimethyl ester (Et3BTC) by a one‐pot solvothermal method is reported. Significantly, the SiCDs/Et3BTC hybrid crystals exhibit ultra‐broadband random laser emission over the near ultraviolet‐visible region under 265 nm nanosecond pulsed laser excitation. The wavelength region of laser emission is achieved from 315 to 600 nm within an emission band of CDs‐based materials. It is worth noting that the wavelength range of the laser is wider than the previously reported works. It is proposed that the continuous white‐light emission of SiCDs caused by multiple fluorescence centers mainly gives rise to the broadband random laser emission. Moreover, the crystals are conducive to forming resonance and realizing solid‐state laser emission. This in‐situ method is expected to enable a more convenient, cheaper, and greener approach to prepare luminescent hybrids for application in multicolor laser displays, multi‐level laser anti‐counterfeiting, supercontinuum light sources, and so on. In‐situ prepared white‐light emissive hybrids of silane‐functionalized carbon dots and 1,3,5‐benzenetricarboxylic acid trimethyl ester are obtained by a one‐pot method. An ultra‐broadband solid‐state random laser is realized by these hybrid crystals in the near ultraviolet–visible region under 265 nm nanosecond pulsed laser excitation. A ulticolor laser from 315 to 600 nm is produced through bandpass filters.