8.1: Invited Paper: TDEL: Technology Evolution in Inorganic Electroluminescence

Wu, Xingwei; Carkner, Don

doi:10.1889/1.2036189

Cited by 7 publications

(5 citation statements)

References 3 publications

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“…Red EL devices, with phosphors such as Eu 2 O 3 [10], Ga 2 O 3 :Eu [11,12], and IGZO:Eu [13], were also developed using alternative device structures. However, only the use of a color filter with the yellow ZnS:Mn phosphor resulted in sufficiently high red luminescence to be used in commercial products [14]. This solution is unfortunately not suitable for transparent display applications as the use of filters reduces the overall transparency of the device.…”

Section: Introductionmentioning

confidence: 99%

Red Y2O3:Eu-Based Electroluminescent Device Prepared by Atomic Layer Deposition for Transparent Display Applications

et al. 2021

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Y2O3:Eu is a promising red-emitting phosphor owing to its high luminance efficiency, chemical stability, and non-toxicity. Although Y2O3:Eu thin films can be prepared by various deposition methods, most of them require high processing temperatures in order to obtain a crystalline structure. In this work, we report on the fabrication of red Y2O3:Eu thin film phosphors and multilayer structure Y2O3:Eu-based electroluminescent devices by atomic layer deposition at 300 °C. The structural and optical properties of the phosphor films were investigated using X-ray diffraction and photoluminescence measurements, respectively, whereas the performance of the fabricated device was evaluated using electroluminescence measurements. X-ray diffraction measurements show a polycrystalline structure of the films whereas photoluminescence shows emission above 570 nm. Red electroluminescent devices with a luminance up to 40 cd/m2 at a driving frequency of 1 kHz and an efficiency of 0.28 Lm/W were achieved.

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Section: Introductionmentioning

confidence: 99%

Red Y2O3:Eu-Based Electroluminescent Device Prepared by Atomic Layer Deposition for Transparent Display Applications

et al. 2021

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“…Inorganic electroluminescence is used in full-color displays. 37) The polarization characteristics of a nanostripe electrode in an inorganic EL device prevent external light reflection and may improve the visibility of the display. Although an antireflective film composed of a polarizing plate and a quarter-wave (λ=4) plate is usually used with the electrode, we used only a nanostripe electrode to evaluate its performance.…”

Section: Introductionmentioning

confidence: 99%

Optical properties of inorganic electroluminescent devices with nanostripe electrodes

Nonaka¹,

Yamamoto²

2016

Jpn. J. Appl. Phys.

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In this paper, we report on the luminescence (emission) characteristics of a laminated dispersion-type inorganic electroluminescent (EL) device with a nanostripe electrode made of thin Al film, instead of a conventional indium–tin oxide (ITO) transparent electrode, on the emission side of the device. The transmittance of the Al nanostripe electrode, with 60-nm line-and-space widths, was 45%. We compared an inorganic EL device positioned between two thin films of Al and the inorganic EL device with the Al nanostripe electrode using electric field simulations and actual experiments. We were able to apply the same electric field intensity to the phosphor layer in the conventional structure and to the new structure. Therefore, with an Al nanostripe electrode on one side of the EL device, it is possible to fabricate an ITO-free display.

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“…Currently, it is the best choice that thin film of barium thioaluminate phosphors doped by europium which provides effective blue color and high brightness required by full-color inorganic electroluminescence displays. [1][2][3][4][5] Fig. 1 shows the typical structure of BaAl 2 S 4 :Eu TFEL device.…”

Section: Introductionmentioning

confidence: 99%

Research and analysis on the thin films sputtered by the Ba-Al-S:Eu target fabricated by powder sintering

Zhang

et al. 2014

SPIE Proceedings

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Europium-doped barium thioaluminate (BaAl 2 S 4 :Eu) is currently the most efficient blue phosphor for inorganic thin film electroluminescent (iEL) device. To produce the full-color EL device, several kinds of blue-emitting layer were attempted and tested. As a key point of blue-emitting layer fabrication, single target sputtering deposition is an effective method. In this work, new structural target is introduced and the fabricated process is expatiated. The PL spectra of asfabricated targets show that both of two, 3mol% and 5mol% europium-doped, have blue emitting property. According to the PL spectra excited by 290nm, 300nm and 320nm ultraviolet, emission peaks located in the region near 470nm. So the as-fabricated targets can be used in single target sputtering deposition on thin film of BaAl 2 S 4 :Eu. XRD pattern indicates that there are 4 different phases, barium tetraaluminum sulfide (BaAl 4 S 7 ), barium sulfide (BaS), europium sulfide (EuS) and barium aluminum oxide (BaAl 2 O 4 ), in target 1. Besides these four compounds, other two phases, aluminum sulfide (Al 2 S 3 ) and barium thioaluminate (BaAl 2 S 4 ), are detected in target 2. Considering the analysis results, especially the hydrolyzation of Al 2 S 3 , target 1 is more suitable for sputtering deposition of BaAl 2 S 4 :Eu thin film. XPS and X-ray Fluorescence patterns describe the precise molar ratio of each element. In target 1 the relative atom concentration of barium, aluminum, sulfur and oxygen can be calculated from the pattern and molar ratio is about 9:33:41:17. Molar ratio of barium and europium is about 1:0.03. In short, the barium thioaluminate doped by europium sputtering target 1 is better to be applied in the fabrication of blue-emitting layer in inorganic electro-luminescent devices.

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8.1: Invited Paper: TDEL: Technology Evolution in Inorganic Electroluminescence

Cited by 7 publications

References 3 publications

Red Y2O3:Eu-Based Electroluminescent Device Prepared by Atomic Layer Deposition for Transparent Display Applications

Red Y2O3:Eu-Based Electroluminescent Device Prepared by Atomic Layer Deposition for Transparent Display Applications

Optical properties of inorganic electroluminescent devices with nanostripe electrodes

Research and analysis on the thin films sputtered by the Ba-Al-S:Eu target fabricated by powder sintering

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