• 제목/요약/키워드: Electroluminescence device

검색결과 187건 처리시간 0.024초

Graphene을 첨가하여 스크린 프린팅으로 제작한 ZnS:Cu,Al 무기 전계발광 소자의 광특성 (Optical Properties of Graphene Doped ZnS:(Cu,Al) Inorganic Electroluminescence Devices by Screen Printing)

  • 조성호;이상남
    • 한국광학회지
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    • 제26권5호
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    • pp.265-268
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    • 2015
  • 본 연구에서는 스크린 인쇄 방법을 이용하여 무기 전계발광 소자를 제작하였다. 발광층은 녹색 형광체인 ZnS : Cu, Al을 사용하고, 전도성 재료로 잘 알려진 graphene를 첨가하여 EL 소자의 발광 휘도 및 효율을 향상시키고자 하였다. Graphene의 농도증가에 따라 PL 휘도는 다소 감소하였으나, EL 발광 효율의 증가를 확인하였으며, 0.6 wt% 첨가에서 가장 높은 휘도를 나타냈다.

자외선-C 발광 YPO4:Pr3+ 분말제조 및 YPO4:Pr3+-PVDF 전계 발광소자 특성 연구 (Fabrication of UV-C Emitting YPO4:Pr3+ Powder and Properties of YPO4:Pr3+-PVDF Electroluminescence Device)

  • 백경도;아판디 모하메드;박재홍;김종수;정용석
    • 반도체디스플레이기술학회지
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    • 제21권2호
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    • pp.15-18
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    • 2022
  • The ultraviolet-C emitting praseodymium doped yttrium phosphate (YPO4:Pr3+) powder was synthesized by conventional solid-state reaction. The electroluminescence device was fabricated by simple screen-printing method using the synthesized YPO4:Pr3+ powder, especially, polyvinylidene fluoride as an insulating layer was applied on the printed YPO4:Pr3+ powder for stable performance of the electroluminescence. The electroluminescence properties were investigated under alternating current power system of 400 Hz. The device starts to emit at 350 V, which showed the ultraviolet-C emission peaking at the 233, 245, 264, 273 nm attributed to electronic transition of the Pr3+ ions. The electroluminescence intensity was increased as increasing the operating voltage and the device revealed stable performance up to 600 V due to the polyvinylidene fluoride serve as a protective layer.

Y2SiO5:Eu3+ 형광체 기반 적색 전계 발광 소자 (Red-emissive Y2SiO5:Eu3+ Phosphor-based Electroluminescence Device)

  • 정현지;박순호;김종수;허 훈
    • 반도체디스플레이기술학회지
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    • 제22권1호
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    • pp.83-87
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    • 2023
  • Y2SiO5 Powder based on silicon and yttrium is well known as powder phosphors due to their excellent sustainability and efficiency. A new electroluminescence device was fabricated with Y2SiO5:Eu3+ powder phosphors though a simple screen printing method. The powder-dispersed electroluminescence device consisted of the Y2SiO5:Eu3+ powder-dispersed phosphor layer and BaTiO3-dispersed dielectric layer. The annealing temperature of the phosphor for the best powder electroluminescence performance was optimized to high temperature in ambient atmosphere though a solid-state reaction. The Eu3+ concentration for the best device performance was also investigated and furthermore, the thermal dependence of the electroluminescence intensity was investigated at the operating voltage at 100℃, which is the Curie temperature of the BaTiO3 layer. And the intensity was exponentially increased with voltage and increased linearly with frequency.

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MEH-PPV를 이용한 유기전계발광소자의 열적 특성 분석 (Thermal Characteristics Analysis of Organic Electroluminescence Device using MEH-PPV)

  • 박재영;박승욱;신무환
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2001년도 추계학술대회 논문집 Vol.14 No.1
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    • pp.112-116
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    • 2001
  • Organic Electroluminescence device, which have the single-layer structure of ITO(indium-tin-oxide)/MEH-PPV (Poly[2-(2'-ethylhexyloxy )-5-methoxy-1,4-pheny lenevinylene])/Al(aluminium) and ITO/MEH-PPV/$Alq_3$(tris-8-hydroxyquinolinato aluminium)/Al were fabricated and electrical properties were investigated. Experimental results, in single-layer structure, shown that turn on voltage is about 12 V, and current density increases as a function of increasing temperature. It was explained by thermionic emission. In double-layer structure, thickness $200\AA$ of $Alq_3$ is shown electrical properties that turn on voltage is about 11 V, and current density decreases as a function of increasing temperature.ࠀȀ 耀Ѐ€

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MEH-PPV를 이용한 유기전계발황소자의 열적 특성 분석 (Thermal Characteristics Analysis of Organic Electroluminescence Device using MEH-PPV)

  • 박재영;박승욱;신무환
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2001년도 추계학술대회 논문집
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    • pp.112-116
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    • 2001
  • Organic Electroluminescence device, which have the single-layer structure of ITO(indium-tin-oxide)/MEH-PPV (Poly [2-(2'-ethylhexyloxy)-5-methoxy-1, 4-phenylenevinylene])/Al(aluminium) and ITO/MEH-PPV/Alq$_3$(tris-8-hydroxyquinolinato aluminium)/Al were fabricated and electrical properties were investigated. Experimental results, in single-layer structure, shown that alum on voltage is about 12 V, and current density increases as a function of increasing temperature. It was explained by thermionic emission. In double-layer structure, thickness 200 $\AA$ of Alq$_3$ is shown electrical properties that turn on voltage is about 11V, and current density decreases as a function of increasing temperature.

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색소 doped 유기EL 소자에 의한 고효율화 (Organic Electroluminescence Device using Dye doped Emitting)

  • 임장순;강성종;노병규;오환술
    • 대한전자공학회:학술대회논문집
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    • 대한전자공학회 2000년도 추계종합학술대회 논문집(2)
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    • pp.261-264
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    • 2000
  • Organic light emitting diodes(OLEDs) have been expected to find an application as a new type of display since C. W. Tang and VanSlyke first reported on high performance OLEDs. This paper has been stuied a green organic EL device using dye doped emitting layer such as C6(Coumarin 6). In the Alq-based e]ectroluminescence diodes, we applied highly fluorescent molecular(Coumarin 6) and obtained enhancement in the electroluminescence efficiency.

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Alq$_3$ 박막의 전기전도와 발광특성 (Electroluminescence Characteristics and Electrical Conduction of Alq$_3$ thin film)

  • 이청학;유선규;이종찬;박대희
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 1998년도 춘계학술대회 논문집
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    • pp.439-442
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    • 1998
  • In this paper, organic thin film LED(light emitting diode) having ITO glass/Alq$_3$/Al structure using an Alq$_3$ was fabricated by the vacuum evaporation and the absorbance, wave length, I-V characteristics were investigated, Electroluminescence of green and wavelength of 510[nm] were observed in this device. We observed absorbance form 320[nm] to 430[nm] and knew unstability of Alq$_3$ material as light emitting device.

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Application of Hypothetical Quantum Scattering Model for the Design of Novel Electroluminescence Device

  • Jang, Hyo-Weon
    • Bulletin of the Korean Chemical Society
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    • 제23권6호
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    • pp.807-811
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    • 2002
  • We present a hypothetical quantum scattering model to propose a novel electroluminescence device. Adoping with features of solid state semiconductor LED and exciplex laser, the cathode (electrol incoming potential) and anode(electron outgoing potential) are made to correspond to two 1-dimensional resonance supporting potentials, and the light emitting part to an interaction potential in the intermediate region. When an external voltage is applied, the electron flows into the cathode having small work function. Subsequently in flows via LUMO of the " electron incoming potential" loses kinetic energy emitting a photon, then continues to flow via LUMO of the "electron outgoing potential" unlike the conventional LUMO to HOMO transitions occurring in solid state semiconductor LED. In this model, the photon frequency can be controlled by adijusting the applied voltage. The model hopefully could be realized as partially conjugated hydrocarbon chains.

Electroluminescent Devices Using a Polymer of Regulated Conjugation Length and a Polymer Blend

  • Zyung, Tae-Hyoung;Jung, Sang-Don
    • ETRI Journal
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    • 제18권3호
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    • pp.181-193
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    • 1996
  • A blue light emitting device has been successfully fabricated using a polymer with regulated conjugation length containing trimethylsilyl substituted phenylenevinylene units. Electroluminescence from the device has an emission maximum at 470 nm. The device shows typical diode characteristics with operating voltage of 20 V and the light becomes visible at a current density of less than $0.5;mA/cm^2$. The electroluminescence spectrum is virtually identical with the photoluminescence spectrum, indicating that the radiation mechanisms are the same for both. A light emitting device using the blend of a large band gap polymer and a small band gap polymer was also fabricated. Light emission from the small band gap polymer shows much improved quantum efficiency, but there is no light emission from the large band gap polymer. Quantum efficiency of the blend increases up to about two orders of magnitude greater than that of the small band gap polymer with increasing proportion of the large band gap polymer. The improvement in quantum efficiency is interpreted in terms of exciton transfer and the hole blocking behaviour of the large band gap polymer. Finally, we have fabricated a patterned flexible light emitting device using the high quantum efficiency polymer blend system.

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