Improved performance of flexible white hybrid light emitting diodes by adjusting quantum dots distribution in polymer matrix

Wu, Wei; Li, Fushan; Nie, Chen; Wu, Jiaqi; Chen, Wei; Wu, Chaoxing; Guo, Tao

doi:10.1016/j.vacuum.2014.09.009

Cited by 10 publications

(5 citation statements)

References 22 publications

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“…Hence, diverse molecular engineering procedures have been reported, such as doping conjugated polymers with conductive elements to ameliorate their conductivities [ 5 , 6 ]. Compared to inorganic semiconductors, these materials offer good flexibility and easier processing, leading to easier modulation of electronic, optical, and mechanical properties [ 7 , 8 , 9 , 10 , 11 , 12 , 13 ]. Handicaps related to fragility and a lower operating lifetime can be overcome by adding a small amount of carbon nanotubes (CNTs) [ 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

Polymer/Carbon Nanotube Based Nanocomposites for Photovoltaic Application: Functionalization, Structural, and Optical Properties

et al. 2022

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We present a systematic review of nanostructured organic materials, including synthesis methods, functionalization, and applications. First, we report the chemical and physical procedures used for preparing the polymer/carbon nanotube composites described in the literature over the last decade. We compare the properties of different polymer-based prototypes of organic nanocomposites functionalized with carbon nanotubes. Theoretical and experimental vibrational investigations provide evidence of the molecular structure describing the interaction between both components, showing that the allowed amount of carbon nanotubes and their dispersion states differ across polymers. Moreover, the nature of the solvent used in the preparation has a significant impact on the dispersion process. The integration of these materials in photovoltaic applications is discussed, where the impact of nanoparticles is evidenced through the correlation between experimental analyses and theoretical approaches based on density functional theory. Alterations in optical properties, evaluated from the absorption and luminescence process, are coherent with the solar spectrum, and a good distribution of donor/acceptor interpenetration was observed. In all cases, it was demonstrated that the performance improvement is physically related to the charge transfer from the organic matrix to the nanoparticles.

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Section: Introductionmentioning

confidence: 99%

Polymer/Carbon Nanotube Based Nanocomposites for Photovoltaic Application: Functionalization, Structural, and Optical Properties

et al. 2022

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“…When compared with organic fluorophores, QD exhibits important advantages; these include narrow emission spectra and ‘‘tuneable’’ spectroscopic properties due to the capability of QD to generate multicolor fluorescence with a single excitation wavelength, high quantum yields, and photochemical stability . These properties stimulated commercial applications of QDs in display and surpasses that of the electronic displays based on organic light‐emitting diodes . In this sense, application nanocrystals in sensors, optoelectronic devices, and solar cells requires stabilization of QDs in solid state and the most common method to stabilize QDs in the form of colloids into solid state is by mixing QDs with polymers matrices .…”

Section: Introductionmentioning

confidence: 99%

“…These properties stimulated commercial applications of QDs in display and surpasses that of the electronic displays based on organic light‐emitting diodes . In this sense, application nanocrystals in sensors, optoelectronic devices, and solar cells requires stabilization of QDs in solid state and the most common method to stabilize QDs in the form of colloids into solid state is by mixing QDs with polymers matrices . Particularly, polymers offer mechanical properties such as flexibility, which enhance the potential applications of these hybrid materials (QDs‐polymer) above the rigid materials commonly used in conventional optoelectronics .…”

Section: Introductionmentioning

confidence: 99%

“…In this sense, application nanocrystals in sensors, optoelectronic devices, and solar cells requires stabilization of QDs in solid state and the most common method to stabilize QDs in the form of colloids into solid state is by mixing QDs with polymers matrices . Particularly, polymers offer mechanical properties such as flexibility, which enhance the potential applications of these hybrid materials (QDs‐polymer) above the rigid materials commonly used in conventional optoelectronics . On the other hand, flexible materials with QDs is a new emerging field, especially in shape, conforming systems such as portable energy‐harvesting devices, electronic skin, and wearable electronic devices, which need high flexibility and stretchability …”

Section: Introductionmentioning

confidence: 99%

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Flexible fluorescent films based on quantum dots (QDs) and natural rubber

Danna

Osorio-Román

Dognani

et al. 2017

J of Applied Polymer Sci

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This article presents the fabrication and characterization of polyisoprene fluorescent films doped with CdTe quantum dots (QDs). The biopolymer (polyisoprene) is extracted from natural rubber latex, generating flexible and transparent films in visible range (transmittance over 90%) ideal as a matrix to support QDs. The water solubility of the biopolymer facilitates its doping with water dispersed QDs at room temperature to obtain the fluorescent films. Thermogravimetric analysis reveals that QDs have no significant effect on the thermal properties of the biopolymer. Photophysical characterization of the solution and solid state (films) of the QDs evidenced that the polymer matrix does not influence its emission properties, the maximum fluorescence peaks have only 2 nm of difference between the solution and solid state (films) samples. Therefore, polyisoprene from natural rubber can be considered as an excellent flexible matrix to fabricate fluorescent films with QDs. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45459.

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“…[2] Torriss et al [13] realized the white-QLEDs by using red-QDs and blue organic molecule iridium(III)bis(2-(4,6-difluorephenyl) pyridinato-N,C2) (Ir(III)DP) dispersed into poly(N-vinylcarbazole) (PVK) as EML. Wu et al [14] reported white-QLEDs with red-QDs and 4, 4-bis(2,2-diphenylethen-1-yl) biphenyl (DPVBi) dispersed into PVK as EML. In the above cases, the multicolor emitters (QDs and/or organic molecule) are blended into a single EML and interact in a non-trivial way.…”

Section: Introductionmentioning

confidence: 99%

Bright hybrid white light-emitting quantum dot device with direct charge injection into quantum dot

et al. 2016

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A bright white quantum dot light-emitting device (white-QLED) with 4-[4-(1-phenyl-1H-benzo[d]imidazol-2yl)phenyl]-2-[3-(tri-phenylen-2-yl)phen-3-yl]quinazoline deposited on a thin film of mixed green/red-QDs as a bilayer emitter is fabricated. The optimized white-QLED exhibits a turn-on voltage of 3.2 V and a maximum brightness of 3660 cd/m 2 @8 V with the Commission Internationale de l'Eclairage (CIE) chromaticity in the region of white light. The ultra-thin layer of QDs is proved to be critical for the white light generation in the devices. Excitation mechanism in the white-QLEDs is investigated by the detailed analyses of electroluminescence (EL) spectral and the fluorescence lifetime of QDs. The results show that charge injection is a dominant mechanism of excitation in the white-QLED.

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Improved performance of flexible white hybrid light emitting diodes by adjusting quantum dots distribution in polymer matrix

Cited by 10 publications

References 22 publications

Polymer/Carbon Nanotube Based Nanocomposites for Photovoltaic Application: Functionalization, Structural, and Optical Properties

Polymer/Carbon Nanotube Based Nanocomposites for Photovoltaic Application: Functionalization, Structural, and Optical Properties

Flexible fluorescent films based on quantum dots (QDs) and natural rubber

Bright hybrid white light-emitting quantum dot device with direct charge injection into quantum dot

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