Green synthetic strategy of BCNO nanostructure and phosphor-based light – Emitting diodes

Kang, Youngjong; Yuan, Bo; Zhang, Dongjiu; Ma, Tao; Huang, Xiaoguang; Chu, Zengyong; Lai, Kan

doi:10.1016/j.jlumin.2016.07.057

Cited by 13 publications

(5 citation statements)

References 37 publications

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“…The unchanged lattice distance of 0.212 nm from the TEM image and a hexagonal pattern from fast Fourier transform (FFT) image indicate that the embedded GQD did not undergo any decomposition during the microwave treatment. A set of TEM images for pristine BNO prepared from precursors without GQDs showed lattice distance of 0.252 nm (Figure S1a, Supporting Information), which arises from the hexagonal boron nitride (h‐BN) or crystalline BO structures …”

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confidence: 99%

Efficient Solid‐State Photoluminescence of Graphene Quantum Dots Embedded in Boron Oxynitride for AC‐Electroluminescent Device

et al. 2018

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Emerging graphene quantum dots (GQDs) have received much attention for use as next-generation light-emitting diodes. However, in the solid-state, π-interaction-induced aggregation-caused photoluminescence (PL) quenching (ACQ) in GQDs makes it challenging to realize high-performance devices. Herein, GQDs incorporated with boron oxynitride (GQD@BNO) are prepared from a mixture of GQDs, boric acid, and urea in water via one-step microwave heating. Due to the effective dispersion in the BNO matrix, ACQ is significantly suppressed, resulting in high PL quantum yields (PL-QYs) of up to 36.4%, eightfold higher than that of pristine GQD in water. The PL-QY enhancement results from an increase in the spontaneous emission rate of GQDs due to the surrounding BNO matrix, which provides a high-refractive-index material and fluorescence energy transfer from the larger-gap BNO donor to the smaller-gap GQD acceptor. A high solid-state PL-QY makes the GQD@BNO an ideal active material for use in AC powder electroluminescent (ACPEL) devices, with the luminance of the first working GQD-based ACPEL device exceeding 283 cd m . This successful demonstration shows promise for the use of GQDs in the field of low-cost, ecofriendly electroluminescent devices.

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confidence: 99%

Efficient Solid‐State Photoluminescence of Graphene Quantum Dots Embedded in Boron Oxynitride for AC‐Electroluminescent Device

et al. 2018

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“…The quantum yield (QY) of GQD aqueous solution were measured at two wavelengths; exciting at 370 nm, the QY resulted to be of 32%, on the contrary, the QY excitation at 410 nm resulted to diminish to 11%. The QY at 370 nm is very high if compared to other carbon-based nanodots, 1 especially those derived from similar precursors, 19,21,27 indicating the important role played by the acids in the synthesis of bright nanodots (Table S2 †). Besides, time resolved measurements at both 370 and 410 nm excitations were performed to investigate the decay kinetics of the emission.…”

Section: Synthesis and Characterization Of Porous Gqds-assembliesmentioning

confidence: 96%

“…We believe that the use of acids during the hydrothermal carbonization of organic systems promotes the formation of uorescent nanodots with high quantum yield. [19][20][21] Herein, we investigated the effect of H 3 PO 4 on the formation of graphitic nanodots. Fluorescent GQDs were synthesized under hydrothermal conditions from urea and glucose in presence of phosphoric acid and adapted to a microwave reactor, instead of pyrolysis of the reagents 22 for minimizing time and saving energy.…”

Section: Synthesis and Characterization Of Porous Gqds-assembliesmentioning

confidence: 99%

“…This unstructured absorption is very common for graphitic and carbonaceous nanodots although slightly dependent on the synthetic route. 21,23 The two lower-wavelength bands at 257 and 277 nm are mostly due to transitions of the sp 2 cores, conrming the formation of GQDs. In contrast, the UV band are usually associated to surface states derived from n-p* transitions linked to the presence of double bonds of carbon and heteroatoms, like C]O, at the edges of the graphitic sheets.…”

Section: Synthesis and Characterization Of Porous Gqds-assembliesmentioning

confidence: 99%

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One-pot synthesis of graphene quantum dots and simultaneous nanostructured self-assembly via a novel microwave-assisted method: impact on triazine removal and efficiency monitoring

et al. 2018

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“…The incorporation of GQDs occurred uniformly in h-BN resulted in BCNO phosphors with reduced bandgap. The blue emission ∼477 nm was obtained under excitation of 355 nm[71]. D. S. Bobade et al reports the synthesis of ZnAl 2 O 4 : Ce 3+ using aloe vera extract.…”

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confidence: 99%

Review on long afterglow nanophosphors, their mechanism and its application in round-the-clock working photocatalysis

Bidwai¹,

Sahu²,

Dhoble³

et al. 2022

Methods Appl. Fluoresc.

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Semiconductor assisted photocatalysis is one of the most efficient methods for the degradation of complex organic dyes. A major limiting factor of semiconductor assisted photocatalysis is the requirement of a continuous source of light to perform a redox reaction. One of the upcoming solutions is photon energy-storing long afterglow/persistent phosphors. They are an unusual kind of rechargeable, photon energy capturing/trapping phosphors that can trap charge carriers (electrons/holes) in their meta-stable energy levels, thereby resulting in persistent luminescence. Persistence luminescence from such materials can range from minutes to hours. The coupling of long afterglow phosphors (LAP) with the conventional semiconductor is a promising way to support the photocatalytic process even in dark. In addition, dissimilar band structures of LAPs and semiconductor results in formation of heterojunction which further suppresses the recombination of charge. Such an encouraging idea of LAP for round-the-clock working photocatalytic system is in its premature stage; which is required to be investigated fully. Thus, we present a state-of-art review on the potential materials for assisting round-the-clock photocatalysis, trapping-detrapping mechanism in LAP materials, fabrication strategies and their associated characterization tools. Review also covers LAP materials and their photocatalytic mechanism briefly.

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Green synthetic strategy of BCNO nanostructure and phosphor-based light – Emitting diodes

Cited by 13 publications

References 37 publications

Efficient Solid‐State Photoluminescence of Graphene Quantum Dots Embedded in Boron Oxynitride for AC‐Electroluminescent Device

Efficient Solid‐State Photoluminescence of Graphene Quantum Dots Embedded in Boron Oxynitride for AC‐Electroluminescent Device

One-pot synthesis of graphene quantum dots and simultaneous nanostructured self-assembly via a novel microwave-assisted method: impact on triazine removal and efficiency monitoring

Review on long afterglow nanophosphors, their mechanism and its application in round-the-clock working photocatalysis

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