• 제목/요약/키워드: electronic materials

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Fluorescent RGB and White OLEDs with High Performance

  • Jinde, Yukitoshi;Tokairin, Hiroshi;Arakane, Takashi;Funahashi, Masakazu;Kuma, Hitoshi;Fukuoka, Kenichi;Ikeda, Kiyoshi;Yamamoto, Hiroshi;Hosokawa, Chishio
    • 한국정보디스플레이학회:학술대회논문집
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    • 한국정보디스플레이학회 2006년도 6th International Meeting on Information Display
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    • pp.351-354
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    • 2006

  • We developed highly efficient fluorescent dopants for full-color OLEDs. For blue, green and red OLEDs, current efficiencies of 8.7cd/A, 20.5 cd/A and 11.4 cd/A at $10mA/cm^2$ were achieved, respectively. Lifetime of the blue device was estimated to be 23,000hours at an initial luminance of $1,000cd/m^2$. Moreover, long lifetime over 100,000 hours was estimated in the green and red devices. Furthermore, we obtained a three-component white OLED by using these new fluorescent materials. This white OLED shows a current efficiency of 16.1cd/A with extrapolated lifetime over 70,000 hours at $1,000cd/m^2$, and more excellent color reproducibility for full-color displays with color filters and general lighting, compared to previous fluorescent white OLEDs.

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FABRICATION OF HIGH QUALITY YBa$_2$Cu$_3$O$_{y}$ THIN FILMS USING PULSED LASER DEPOSITION

  • Lee, Eun-Hong;Park, Sang-Jin;Song, I-Hun;Song, In-Sang;Gohng, Jun-Ho;Sok, Jung-Hyun;Lee, Jo-Won
    • 한국표면공학회지
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    • 제29권5호
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    • pp.437-442
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    • 1996

  • High quality $YBa_2Cu_3O_y$(YBCO) thin films for directly coupled dc superconducting quantum interference device (SQUID) were fabricated by pulsed laser deposition. Several critical parameters have been optimized through systematic studies. Thus, the films showing the $T_c$ of above 91K and $J_c$ of above$2\times10^6A/cm^2$ at 77K were routinely obtained. Extensive AFM and X-ray diffraction studies have been conducted for morphological and structural analyses. The directly coupled DC-SQUIDs were fabricated from the YBCO thin films deposited on $SrTiO_3$ bicrystals under the optimized conditions. The measurement on $2I_c$ and swing voltage give 200$\mu$A and 17$\mu$V at 77K, respectively.

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티타늄 이소프로폭사이드를 이용한 졸-겔법에 의한 TiN 코팅 cBN 분말 합성 (Synthesis of TiN-Coated cBN Powder by Sol-Gel Method Using Titanium (IV) Isopropoxide)

  • 이윤성;김선욱;이영진;이지선;신동욱;김세훈;김진호
    • 한국전기전자재료학회논문지
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    • 제33권5호
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    • pp.373-379
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    • 2020

  • In this study, TiN-coated cBN (cubic-structure boron nitride) powders were successfully synthesized by a sol-gel method using titanium (IV) isopropoxide (TTIP) and by controlling the heat treatment conditions. After the sol-gel process, amorphous nano-sized TiOx was uniformly coated on the surface of cBN powder particles. The obtained TiOx-coated cBN powders were heated at 1,000~1,300℃ for 1 or 6 h in a flow of 95%N2-5%H2 mixed gas. With increasing temperature, the chemical composition of the TiOx coating layer changed in the order of TiO2→Ti6O11→Ti4O7→TiN due to reduction of the Ti ions. The TiN coating layer was observable in the samples heated at 1,200℃ and appeared as the main phase in the sample heated at 1,300℃. The resulting thickness of the TiN coating layer of the sample heated at 1,300℃ was approximately 45~50 nm.

  • https://doi.org/10.4313/JKEM.2020.33.5.373 인용 PDF KSCI