Polymer-II-VI Nanocrystals Blends: Basic Physics and Device Applications to Lasers and LEDs

Anni, M.

doi:10.3390/nano9071036

Cited by 27 publications

(16 citation statements)

References 107 publications

(137 reference statements)

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“…Semiconductor nanocrystals (NCs) and quantum dots (QDs) prepared by colloidal syntheses represent an ever-growing area of fundamental research that envisages numerous applications [ 1 , 2 ]. NCs with strong absorption over the solar irradiation range were developed for new generation solar cells [ 3 ].…”

Section: Introductionmentioning

confidence: 99%

“…Even though the recent trend towards so-called “greener” NC materials, such as Ag-In-S and Ag-In-S/ZnS [ 7 ], Cu 2 ZnSnS 4 [ 8 ], Cu 3 SnS 4 [ 9 ], Cu-In-S(e) [ 10 , 11 , 12 ] is observed, II-VI NCs remain a “benchmark” model system for the investigation of the confinement-related phenomena [ 13 ], surface chemistry and physics [ 14 ], and electronic interactions of strongly confined semiconductor NC with excited molecular [ 15 ] and plasmonic [ 16 , 17 , 18 ] species. Incorporation of semiconductor NCs in polymer matrices is a major step in a big segment of applications exploiting the optical/luminescent properties of NCs [ 1 , 5 ].…”

Section: Introductionmentioning

confidence: 99%

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Photoinduced Enhancement of Photoluminescence of Colloidal II-VI Nanocrystals in Polymer Matrices

et al. 2020

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The environment strongly affects both the fundamental physical properties of semiconductor nanocrystals (NCs) and their functionality. Embedding NCs in polymer matrices is an efficient way to create a desirable NC environment needed for tailoring the NC properties and protecting NCs from adverse environmental factors. Luminescent NCs in optically transparent polymers have been investigated due to their perspective applications in photonics and bio-imaging. Here, we report on the manifestations of photo-induced enhancement of photoluminescence (PL) of aqueous colloidal NCs embedded in water-soluble polymers. Based on the comparison of results obtained on bare and core/shell NCs, NCs of different compounds (CdSe, CdTe, ZnO) as well as different embedding polymers, we conclude on the most probable mechanism of the photoenhancement for these sorts of systems. Contrary to photoenhancement observed earlier as a result of surface photocorrosion, we do not observe any change in peak position and width of the excitonic PL. Therefore, we suggest that the saturation of trap states by accumulated photo-excited charges plays a key role in the observed enhancement of the radiative recombination. This suggestion is supported by the unique temperature dependence of the trap PL band as well as by power-dependent PL measurement.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Photoinduced Enhancement of Photoluminescence of Colloidal II-VI Nanocrystals in Polymer Matrices

et al. 2020

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“…Among the several types of organic semiconductor materials, conjugated materials have been subjected to intensive research studies for many years [1][2][3][4][5][6][7][8][9]. There has been widespread interest in conjugated materials for applications in optoelectronic devices, such as chemical sensors [10], light-emitting diodes [4,7,9], solar cells [5,11,12], and laser optical media [2,6,[13][14][15][16][17]. Conjugated materials have appealing photophysical properties for the implementation of optical devices, namely, large stoke shift emission, excellent gain, strong absorption, high-quality factor, and the ability to produce tunable lasers [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Narrowband Spontaneous Emission Amplification from a Conjugated Oligomer Thin Film

2020

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In this paper, we studied the laser and optical properties of conjugated oligomer (CO) 1,4-bis(9-ethyl-3-carbazo-vinylene)-9,9-dihexyl-fluorene (BECV-DHF) thin films, which were cast onto a quartz substrate using a spin coating technique. BECV-DHF was dissolved in chloroform at different concentrations to produce thin films with various thicknesses. The obtained results from the absorption spectrum revealed one sharp peak at 403 nm and two broads at 375 and 428 nm. The photoluminescence (PL) spectra were recorded for different thin films made from different concentrations of the oligomer solution. The threshold, laser-induced fluorescence (LIF), and amplified spontaneous emission (ASE) properties of the CO BECV-DHF thin films were studied in detail. The ASE spectrum was achieved at approximately 482.5 nm at a suitable concentration and sufficient pump energy. The time-resolved spectroscopy of the BECV-DHF films was demonstrated at different pump energies.

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“…Due to their good optical properties and low-cost large-area processing, organic π-conjugated semiconductors have gained much interest in different kinds of applications such as organic field-effect transistors (OFETs) [1][2][3] light-emitting diodes (OLEDs) [4,5], solar cells (OPVs) [6,7] and semiconductor lasers [8][9][10][11]. Although much progress has been made in optoelectronic devices such as OLEDs, conjugated molecules, to date, neither oligomers nor polymers have found applications in real laser devices, either optically or electrically pumped.…”

Section: Introductionmentioning

confidence: 99%

Deep Blue Light Amplification from a Novel Triphenylamine Functionalized Fluorene Thin Film

et al. 2019

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The development of high performance optically pumped organic lasers operating in the deep blue still remains a big challenge. In this paper, we have investigated the photophysics and the optical gain characteristics of a novel fluorene oligomer functionalized by four triphenylamine (TPA) groups. By ultrafast spectroscopy we found a large gain spectral region from 420 to 500 nm with a maximum gain cross-section of 1.5 × 10−16 cm2 which makes this molecule a good candidate for photonic applications. Amplified Spontaneous Emission measurements (ASE) under 150 fs and 3 ns pump pulses have revealed a narrow emission at 450 nm with a threshold of 5.5 μJcm−2 and 21 μJcm−2 respectively. Our results evidence that this new fluorene molecule is an interesting material for photonic applications, indeed the inclusion of TPA as a lateral substituent leads to a high gain and consequently to a low threshold blue organic ASE.

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Polymer-II-VI Nanocrystals Blends: Basic Physics and Device Applications to Lasers and LEDs

Cited by 27 publications

References 107 publications

Photoinduced Enhancement of Photoluminescence of Colloidal II-VI Nanocrystals in Polymer Matrices

Photoinduced Enhancement of Photoluminescence of Colloidal II-VI Nanocrystals in Polymer Matrices

Narrowband Spontaneous Emission Amplification from a Conjugated Oligomer Thin Film

Deep Blue Light Amplification from a Novel Triphenylamine Functionalized Fluorene Thin Film

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