Light Emission of Electroluminescent Lamps Under Different Operating Conditions

Kaiser, Walter; Marqués, R.; Correa, Alexander

doi:10.1109/tia.2013.2260315

“…The luminous emission characteristics of the EL gas sensors are similar to those of standard AC electroluminescence devices comprising an insulating buffer layer. [19][20][21] An increase of applied frequency enhances the rate of injected electrons from the interface states into the phosphor layer while a higher applied voltage creates a higher electric eld that can cause more ionization and impact excitation by accelerated electrons in the luminescent center generating more electron-hole pairs. Therefore, the luminance of EL gas sensor increases with increasing frequency and applied voltage (V rms ).…”

Section: Resultsmentioning

confidence: 99%

Flexible alternating current electroluminescent ammonia gas sensor

En-on

¹

,

Tuantranont

²

,

Kerdcharoen

³

et al. 2017

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In this work, the fabrication and performance of flexible alternating current electroluminescent (AC-EL) devices for ammonia (NH 3 ) detection at room temperature are presented for the first time. The AC-EL gas sensor was fabricated by the screen-printing of a ZnS:Cu,Cl phosphor and PEDOT:PSS sensing layers. The effects of parameters including applied voltage, excitation frequency and waveform on light emission and luminance intensity of the AC-EL gas sensor were systematically investigated. From gassensing characterization, the AC-EL gas sensor exhibited very high selectivity and a linear response to NH 3 in the concentration range of 100-1000 ppm at room temperature. A sensing mechanism of the EL gas sensor was proposed based on the resistance change of the PEDOT:PSS sensing layer via a chargetransfer process.

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“…Looking in more detail, for the increased plasma, power was a direct effect to the improved luminance because the IZO electrode has many electrons and the film surface area that could have led to a faster transfer of electron, which resulted in electron collision. In this case, it is a major factor in the behavior of faradaic current and voltage waveform which has a positive effect on the IZO film surface [58,59]. Furthermore, the EL efficiency (Eff el ) or called power efficiency was calculated by the luminance of EL devices which was multiplied by the area light emission per output power.…”

Section: Luminance Propertiesmentioning

confidence: 99%

High Performance of IZO Coated on PET Substrate for Electroluminescence Device Using Oxygen Plasma Treatment

Poonthong

¹

,

Mungkung

²

,

Arunrungrusmi

³

et al. 2021

International Journal of Photoenergy

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Thin films of indium zinc oxide (IZO) were deposited on polyethylene terephthalate (PET) substrate with varying plasma power (from 100 W to 300 W) using the radio-frequency (RF) magnetron sputtering technique and electroluminescence (EL) devices. The IZO films that were obtained from this process were treated with oxygen plasma powers using the plasma-enhanced chemical vapor deposition (PECVD) system. After this treatment, the microstructural, electrical, and optical properties of IZO films were observed and reported. The result showed that the IZO/PET films was fabricated at the lowest resistivity ( 2.83 × 10 − 3 Ω · cm ), while the optical characterization displayed the maximum transmittance of 95% in the visible region with a smooth morphology and good crystalline structured, affected by the 300 W of plasma power with the optimum carrier concentration ( 4.93 × 10 21 c m − 3 ) and hall mobility (42.12 cm2/V·sec), respectively. The luminance properties and the EL efficiency were also investigated and shown a 300 W highest point of plasma power with 84 cd/m2 and 0.924 lm/W. The film properties were found responsible for producing and improving the performance of IZO/PET substrate, suitable for displaying the devices.

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“…Both plasma conditions of luminance properties and EL efficiency of ITiO PET film was more than that of the plasma un-treatment due to the behavior of voltage waveform and faradaic current causing a charging current in ITiO PET, and the Ag paste surface caused a fast transfer electron. 30,31)…”

Section: Electrical and Luminance Propertiesmentioning

confidence: 99%

Transparent ITiO film electrodes on polyethylene terephthalate by oxygen plasma treatment for high-performance flexible electroluminescence device

Arunrungrusmi¹,

Chansri²,

Mungkung³

2018

Jpn. J. Appl. Phys.

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A plastic electrode transparent is important to flexible optoelectronic devices. The metal oxides are coated in plastic by a variety of methods. The temperature in the process will not exceed 100 °C-150 °C or room temperature. It causes cracking on the film, adhesion on the plastic surface, and impurities on the film. Therefore, plasma oxygen was used to improve the film. In this work, we fabricate plastic electrode transparent with indium titanium oxide (ITiO) film using oxygen (O 2 ) plasma treatment. ITiO film was deposited on polyethylene terephthalate (PET) using the RF magnetron sputtering method. The obtained ITiO PET films were plasma treated with O 2 using the plasma enhanced chemical vapor deposition system at plasma power and plasma treatment time condition. The structural properties and crystalline of ITiO film were confirmed by X-ray diffraction by scanning electron microscope and atomic force microscope. The high transmittance of ITiO films was about 80%-86% of all plasma treatment conditions. The lowest resistivity of the ITiO films with plasma treatment by plasma power condition and plasma treatment time was 7.92 × 10 -1 Ω-cm of 300 W plasma power and 7.81 × 10 −1 Ω-cm of 300 W plasma power, respectively. The luminance properties and EL efficiency of ITiO PET film was 89.21 cd m −2 and 0.0365 lm W −1 for a 60 min treatment time, 72.42 cd m −2 and 0.0297 lm W −1 for plasma power. The use of ITiO on a PET film by oxygen plasma treatment can improve the performance of the display device.

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Light Emission of Electroluminescent Lamps Under Different Operating Conditions

Cited by 8 publications

References 18 publications

Flexible alternating current electroluminescent ammonia gas sensor

Flexible alternating current electroluminescent ammonia gas sensor

High Performance of IZO Coated on PET Substrate for Electroluminescence Device Using Oxygen Plasma Treatment

Transparent ITiO film electrodes on polyethylene terephthalate by oxygen plasma treatment for high-performance flexible electroluminescence device

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