Increase of electroluminescent intensity in planar light-emitting diode structures based on PFO polymer – ZnO nanoparticles composite films operated by alternating-current voltages

Алешин, А. Н.; Щербаков, И. П.; Petrov, V. N.

doi:10.1016/j.ssc.2015.02.020

Cited by 4 publications

(2 citation statements)

References 13 publications

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“…[17][18][19] However, the ZnO QDs and other QDs materials are potential semiconductor materials in electronic devices, such as lasers, OLEDs, and photovoltaic devices, the usual shell materials or doping materials may reduce surface defects and meanwhile bring adverse effect on the electronic and luminescent properties of QDs. [20][21][22][23][24] Another possible way is to keep them at relatively low temperature in closed cavity to avoid contact with the atmosphere, such as in glass capsules, for long service time in device. Further methods of solving the problem of stability of QDs need to be developed to utilize the QDs with high efficient quantum size effect.…”

Section: The Agglomeration Mechanisms Of Zno Qdsmentioning

confidence: 99%

Synthesis of ZnO quantum dots and their agglomeration mechanisms along with emission spectra based on ageing time and temperature

Qiao¹,

Zhao²,

Xu³

et al. 2016

Chinese Phys. B

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The ZnO quantum dots (QDs) were synthesized with improved chemical solution method. The size of the ZnO QDs is exceedingly uniform with a diameter of approximately 4.8 nm, which are homogeneously dispersed in ethanol. The optical absorption edge shifts from 370 nm of bulk material to 359 nm of QD materials due to the quantum size effect, while the photoluminescence peak shifts from 375 nm to 387 nm with the increase of the density of ZnO QDs. The stability of ZnO QDs was studied with different dispersion degrees at 0 • C and at room temperature of 25 • C. The agglomeration mechanisms and their relationship with the emission spectra were uncovered for the first time. With the ageing of ZnO QDs, the agglomeration is aggravated and the surface defects increase, which leads to the defect emission.

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Section: The Agglomeration Mechanisms Of Zno Qdsmentioning

confidence: 99%

Synthesis of ZnO quantum dots and their agglomeration mechanisms along with emission spectra based on ageing time and temperature

Qiao¹,

Zhao²,

Xu³

et al. 2016

Chinese Phys. B

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show abstract

“…Cellulose-based, flexible light-emitting papers were demonstrated in the form of light-emitting electrochemical cells [13] and foldable NCP/ quantum dot (ZnSe) composites [14]. It was shown in our previous research that one can observe the electroluminescent (EL) behavior in other device structures based on composites of semiconducting and lightemitting polymers (PVK/MEH:PPV) [22] as well as on light-emitting polymers with inorganic nanoparticles (PFO:ZnO) [23] operated by DC or AC bias respectively. However, the light-emitting properties of environmentally friendly BC-based composites with soluble light-emitting polymers such as MEH-PPV are still the subject of intensive investigations and debates.…”

Section: Introductionmentioning

confidence: 99%

Light-emitting flexible transparent paper based on bacterial cellulose modified with semiconducting polymer MEH:PPV

Алешин

Щербаков

Хрипунов

et al. 2017

Flex. Print. Electron.

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We demonstrated flexible light-emitting transparent bacterial cellulose (BC) paper modified with semiconducting polymer operated by pulse voltage. We prepared thin (∼ 35 μm) transparent BC films modified with luminescent conjugated polymer MEH:PPV with Ag electrodes. It was shown that the photoluminescence (PL) spectrum of BC/MEH:PPV films contains emission contributions from both BC and MEH:PPV components and that the PL intensity of BC and MEH:PPV maxima versus excitation power is sublinear. This indicates that exciton-exciton annihilation occurs in the lightemitting polymer at high excitation power. We found that the dependences of the spike-like electroluminescence (EL) intensity of BC/MEH:PPV films excited by the pulse voltage at different frequencies versus applied pulse bias and pulse frequency are superlinear. We assume that the turn-on and turn-off spikes originate from the recombination of charges accumulated in the bulk of the semiconducting polymer (bulk de-trapping) during the voltage pulse. The results demonstrate that such composites are prospective for application as flexible, transparent and environmentally friendly light-emitting cellulose-based papers for displays and lighting as well as biosensors.

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Polar‐Electrode‐Bridged Electroluminescent Displays: 2D Sensors Remotely Communicating Optically

Huang

Yan

et al. 2017

Advanced Materials

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A novel geometry for electroluminescent devices, which does not require transparent electrodes for electrical input, is demonstrated, theoretically analyzed, and experimentally characterized. Instead of emitting light through a conventional electrode, light emission occurs through a polar liquid or solid and input electrical electrodes are coplanar, rather than stacked in a sandwich configuration. This new device concept is scalable and easily deployed for a range of modular alternating-current-powered electroluminescent light sources and light-emitting sensing devices. The polar-electrode-bridged electroluminescent displays can be used as remotely readable, spatially responsive sensors that emit light in response to the accumulation and distribution of materials on the device surface. Using this device structure, various types of alternating current devices are demonstrated. These include an umbrella that automatically lights up when it rains, a display that emits light from regions touched by human fingers (or painted upon using a mixture of oil and water), and a sensor that lights up differently in different areas to indicate the presence of water and its freezing. This study extends the dual-stack, coplanar-electrode device geometry to provide displays that emit light from a figure drawn on an electroluminescent panel using a graphite pencil.

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Increase of electroluminescent intensity in planar light-emitting diode structures based on PFO polymer – ZnO nanoparticles composite films operated by alternating-current voltages

Cited by 4 publications

References 13 publications

Synthesis of ZnO quantum dots and their agglomeration mechanisms along with emission spectra based on ageing time and temperature

Synthesis of ZnO quantum dots and their agglomeration mechanisms along with emission spectra based on ageing time and temperature

Light-emitting flexible transparent paper based on bacterial cellulose modified with semiconducting polymer MEH:PPV

Polar‐Electrode‐Bridged Electroluminescent Displays: 2D Sensors Remotely Communicating Optically

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