Ultralow Threshold Lasing from Carbon Dot–Ormosil Gel Hybrid-Based Planar Microcavity

Ni, Yiqun; Han, Zhengsheng; Ren, Junkai; Wang, Zhen; Zhang, Wenfei; Xie, Zheng; Shao, Yufeng; Zhou, Shuyun

doi:10.3390/nano11071762

Cited by 6 publications

(3 citation statements)

References 30 publications

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“…The transition from ASE to the laser regime is characterized by an abrupt increase of the intensity of the longitudinal mode with the highest optical gain. This ASE to laser transition indicates the laser threshold, which is observed at a pump power density of approximately 1.6 kW/cm 2 , which is comparable to other reported CD-based laser systems, mostly ranging from 0.07 to 220 kW/cm 2 . − Figure shows an example of blue laser emission measured at a wavelength of λ = 442 nm yielding ∼45 times higher intensity than the emitted ASE radiation (Figure , inset). Unfortunately, the laser amplification process involves intense localized photon densities that cause thermal damage to the PCD layer.…”

Section: Resultssupporting

confidence: 81%

New Insight into Fluorescent Polymeric Carbon Dots for Solid-State Laser Device

Barman

Hernández‐Pinilla

Cretu

et al. 2023

ACS Sustainable Chem. Eng.

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Polymeric carbon dots (PCDs) are an astonishing class of fluorescent materials with distinctive structures, properties, and applications. However, the internal structures of PCDs are still unclear and are the subject of considerable debate due to their complexity. Herein, a new type of pure blue light-emitting PCDs was synthesized hydrothermally from ε-poly-L-lysine and citric acid. PCDs were observed by using scanning transmission electron microscopy coupled with electron energy loss spectroscopy (STEM-EELS) on an atomically thin graphene surface to determine the internal structure and compositional gradients combined with other spectroscopic analyses. These methods revealed that PCDs have a spongy, porous structure with uniform element distribution, reflecting organic polymeric frameworks that embrace fluorescent aromatic moieties devoid of graphitic, inorganic carbon. The polymeric framework acts as a transparent matrix and effectively resists self-quenching of photoluminescence (PL) in the solid state. Exploiting their excellent fluorescence properties, PCDs were embedded in a planar microcavity composed of two distributed Bragg reflectors (DBR), which was demonstrated as a single longitudinal solid-state blue laser. The results will facilitate a detailed understanding of internal structures of PCDs and their efficient, solid-state emission toward the development of rare-earth-free lighting devices.

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Section: Resultssupporting

confidence: 81%

New Insight into Fluorescent Polymeric Carbon Dots for Solid-State Laser Device

Barman

Hernández‐Pinilla

Cretu

et al. 2023

ACS Sustainable Chem. Eng.

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“…For the first time, the wavelength range of laser reaches 285 nm (315-600 nm) within an emission band of CDs-based materials, which is wider compared to reported works (Table S1, Supporting Information). [24,26,28,[44][45][46][47][48][49][50][51] Under ambient illumination, Et3BTC, SiCDs, and SiCDs/Et3BTC hybrids are white, brown, and light yellow, respectively. Under 365 nm UV lamp, SiCDs/Et3BTC hybrids and SiCDs exhibit cold white fluorescence, while Et3BTC shows no obvious fluorescence (upper right corner of Figure 1).…”

Section: Resultsmentioning

confidence: 99%

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

Wang

Zhang

et al. 2022

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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.

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“…Because of the extraordinary light emission properties, CQDs have excellent properties such as wide tunability, bright luminescence, single-photon emission, biocompatibility, low toxicity, chemical inertness, and ease of biomolecule functionalization, which can be used in bioimaging, drug delivery [40,41], and so on. The CQDs are also widely used in lasing, PVs, and sensing [42][43][44]. Research on fullerene first began in 1985 [45].…”

Section: The Structures Of Nanomaterialsmentioning

confidence: 99%