Bebq2에 (pq)2Ir(acac)가 선택 도핑된 2-파장 유기발광다이오드

김민영; 지현진; 장지근; Min-Young Kim; Hyun-Jin Ji; Ji-Geun Jang

Korean Journal of Materials Research, Vol.21, No.4, 212-215, April, 2011

DOI10.3740/MRSK.2011.21.4.212 Export Citation

Bebq2에 (pq)2Ir(acac)가 선택 도핑된 2-파장 유기발광다이오드

2-Wavelength Organic Light-Emitting Diodes Using Bebq2 Selectively Doped with (pq)2Ir(acac)

김민영, 지현진¹, 장지근^{1, †}

백석문화대학 인터넷정보학부
¹단국대학교 전자공학과

Min-Young Kim, Hyun-Jin Ji¹, and Ji-Geun Jang^{1, †}

Division of Internet Information, Baesokseok Culture University, Cheonan, Chungnam 330-705, Korea
¹Department of Electronics, Dankook University, Cheonan, Chungnam 330-714, Korea

E-mail:

New organic light-emitting diodes with structure of indium-tin-oxide[ITO]/N,N’-diphenyl-N, N’-bis-[4-(phenyl-mtolvlamino)- phenyl]-biphenyl-4,4’-diamine[DNTPD]/1,1-bis-(di-4-poly-aminophenyl) cyclohexane[TAPC]/bis(10-hydroxy-benzo (h)quinolinato)beryllium[Bebq2]/Bebq2:iridium(III)bis(2-phenylquinoline-N,C2')acetylacetonate[(pq)2Ir(acac)]/ET-137[electron transport material from SFC Co]/LiF/Al using the selective doping of 5%-(pq)2Ir(acac) in a single Bebq2 host in the two wavelength (green, orange) emitter formation were proposed and characterized. In the experiments, with a 300A-thick undoped emitter of Bebq2, two kinds of devices with the doped emitter thicknesses of 20A and 40A in the Bebq2:(pq)2Ir(acac) were fabricated. The device with a 20A-thick doped emitter is referred to as “D-1” and the device with a 40A-thick doped emitter is referred to as “D-2”. Under an applied voltage of 9V, the luminance of D-1 and D-2 were 7780 cd/m2 and 6620 cd/m2, respectively. The electroluminescent spectrum of each fabricated device showed peak emissions at the same two wavelengths: 508 nm and 596 nm. However, the relative intensity of 596 nm to 508 nm at those wavelengths was higher in the D-2 than in the D-1. The D-1 and D-2 devices showed maximum current efficiencies of 5.2 cd/A and 6.0 cd/A, and color coordinates of (0.31, 0.50) and (0.37, 0.48) on the Commission Internationale de I'Eclairage[CIE] chart, respectively.

Keywords:Bebq2;(pq)2Ir(acac);2-wavelength OLED;selective doping;single host;luminance

[References]

Kido J, Kimura M, Nagai K, Science, 267(5202), 1332 (1995)
Kido J, Ikeda W, Kimura M, Nagai K, Jpn. J. Appl. Phys., 35, L394 (1996)
Roh BG, Kim JY, Oh HS, J. KIEEME, 13(11), 943 (2000)
Roh BG, Kang MG, Oh HS, J. of KIEEME, 15(5), 429 (2002)
Roh BG, Oh HS, Kim WY, Malliaras GG, in Proceedings of the 2001 International Meeting on Information Displays(Daegu, Korea, August 2001) p.225. (2001)
Lee HM, Gong SC, Shin SB, Park HH, Jeon HT, Chang HJ, J. SDT, 7, 49 (2008)
Jang JG, Chang HJ, Oh MH, Kang JW, Lee JY, Gong MS, Lee YK, Kim HW, Korean J. Mater. Res., 17(4), 198 (2007)
Jang JG, An JM, Sin SB, Jang HJ, Ryu SU, in Proceedings of the Spring Conference of the Korean Society of Semicondector and Display Technology (Seoul, Korea, June 2007) p.34. (2007)
Lee JY, Information Display, (in Korean) http://www.k-ids.or.kr/, 7(1), 4 (2006)
Nguyen TP, Destruel P, Handbook of Luminescence, Display Materials and Devices Vol. 3, p. 90, ed. Nalwa HS, Rohwer LS, ASP, USA (2003). (2003)
Gao Y, Park KT, Hsieh BR, J. Appl. Phys., 73, 7894 (1993)
Do LM, Han EM, Niidome Y, Fujihira M, Kanno T, Yoshida S, Maeda A, Ikushima AJ, J. Appl. Phys., 76, 5118 (1994)
Baldo MA, Forrest SR, Phys. Rev. B Condens. Matter, 62, 10958 (2000)
Baldo MA, Adachi C, Forrest SR, Phys. Rev. B Condens. Matter, 62, 10967 (2000)

[Referenced By]

[1] Kido J, Kimura M, Nagai K, Science, 267(5202), 1332 (1995)

[2] Kido J, Ikeda W, Kimura M, Nagai K, Jpn. J. Appl. Phys., 35, L394 (1996)

[3] Roh BG, Kim JY, Oh HS, J. KIEEME, 13(11), 943 (2000)

[4] Roh BG, Kang MG, Oh HS, J. of KIEEME, 15(5), 429 (2002)

[5] Roh BG, Oh HS, Kim WY, Malliaras GG, in Proceedings of the 2001 International Meeting on Information Displays(Daegu, Korea, August 2001) p.225. (2001)

[6] Lee HM, Gong SC, Shin SB, Park HH, Jeon HT, Chang HJ, J. SDT, 7, 49 (2008)

[7] Jang JG, Chang HJ, Oh MH, Kang JW, Lee JY, Gong MS, Lee YK, Kim HW, Korean J. Mater. Res., 17(4), 198 (2007)

[8] Jang JG, An JM, Sin SB, Jang HJ, Ryu SU, in Proceedings of the Spring Conference of the Korean Society of Semicondector and Display Technology (Seoul, Korea, June 2007) p.34. (2007)

[9] Lee JY, Information Display, (in Korean) http://www.k-ids.or.kr/, 7(1), 4 (2006)

[10] Nguyen TP, Destruel P, Handbook of Luminescence, Display Materials and Devices Vol. 3, p. 90, ed. Nalwa HS, Rohwer LS, ASP, USA (2003). (2003)

[11] Gao Y, Park KT, Hsieh BR, J. Appl. Phys., 73, 7894 (1993)

[12] Do LM, Han EM, Niidome Y, Fujihira M, Kanno T, Yoshida S, Maeda A, Ikushima AJ, J. Appl. Phys., 76, 5118 (1994)

[13] Baldo MA, Forrest SR, Phys. Rev. B Condens. Matter, 62, 10958 (2000)

[14] Baldo MA, Adachi C, Forrest SR, Phys. Rev. B Condens. Matter, 62, 10967 (2000)