[TCTA-TAZ] : Ir(ppy)3 이중 발광층을 갖는 고효율 녹색 인광소자의 제작과 특성 평가

신상배; 신현관; 김원기; 장지근; Sang Baie Shin; Hyun Kwan Shin; Won Ki Kim; Ji Geun Jang

Korean Journal of Materials Research, Vol.18, No.4, 199-203, April, 2008

DOI10.3740/MRSK.2008.18.4.199 Export Citation

[TCTA-TAZ] : Ir(ppy)3 이중 발광층을 갖는 고효율 녹색 인광소자의 제작과 특성 평가

Fabrication and Characterization of High Efficiency Green PhOLEDs with [TCTA-TAZ] : Ir(ppy)3 Double Emission Layers

신상배, 신현관, 김원기, 장지근^†

단국대학교 전자공학과

Sang Baie Shin, Hyun Kwan Shin, Won Ki Kim, and Ji Geun Jang^†

Department of Electronics Engineering, Dankook University, Chungnam 330-714, Korea

E-mail:

High-efficiency phosphorescent organic light emitting diodes using TCTA-TAZ as a double host and Ir(ppy)3 as a dopant were fabricated and their electro-luminescence properties were evaluated. The fabricated devices have the multi-layered organic structure of 2-TNATA/NPB/(TCTA-TAZ) : Ir(ppy)3/BCP/SFC137 between an anode of ITO and a cathode of LiF/AL. In the device structure, 2-TNATA[4,4’,4''-tris(2-naphthylphenyl-phenylamino)-triphenylamine] and NPB[N,N’-bis(1-naphthyl)-N,N’-diphenyl-1,1’-biphenyl-4,4’-diamine] were used as a hole injection layer and a hole transport layer, respectively. BCP [2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline] was introduced as a hole blocking layer and an electron transport layer, respectively. TCTA [4,4’,4''-tris(N-carbazolyl)-triphenylamine] and TAZ [3-phenyl-4-(1-naphthyl)-5-phenyl-1,2,4-triazole] were sequentially deposited, forming a double host doped with Ir(ppy)3 in the [TCTA-TAZ] : Ir(ppy)3 region. Among devices with different thickness combinations of TCTA (50 A-200 A) and TAZ (100 A-250 A) within the confines of the total host thickness of 300 A and an Ir(ppy)3-doping concentration of 7%, the best electroluminescence characteristics were obtained in a device with 100 A-think TCTA and 200 A-thick TAZ. The Ir(ppy)3 concentration in the doping range of 4%-10% in devices with an emissive layer of [TCTA (100 A)-TAZ (200 A] : Ir(ppy)3 gave rise to little difference in the luminance and current efficiency.

Keywords:PhOLED;luminance;current efficiency;TCTA;TAZ

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[1] Tang CW, VanSlyke SA, J. of Appl. Phys. Lett., 51, 913 (1987)

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

[3] Kafafi ZH, Organic Electroluminescence, p. 274-286, Taylor & Francis, New York, (2005). (2005)

[4] Baldo MA, O'Brien DF, You Y, Shoustikov A, Sibley S, Thompson ME, Forrest SR, Nature, 395(6698), 151 (1998)

[5] Adachi C, Baldo MA, Thompson ME, Forrest SR, J. of Appl. Physics, 90, 5048 (2001)

[6] Kim SH, Jang JS, Yook KS, Lee JY, Gong MS, Ryu S, Chang GK, Chang HJ, J. of Appl. Phys. Lett., 103, 054502 (2008)

[7] Zheng T, Choy WCH, J. Phys. D: Appl. Phys., 41, 055103 (2008)

[8] Khalifa MB, Vaufrey D, Tardy J, Organic Electronics, 5, 187 (2004)

[9] Sun J, Zhu X, Yu X, Wong M, Kwok HS, SID 07 DIGEST, 826 (2007). (2007)

[10] Jang JG, Organic Electronics, p.314, Cheongmoongak, Gyonggi, Korea, (2006). (2006)

[11] Farchioni R, Gross G, Organic Electronic Materials, p.428, Springer Series in Materials Science, Berlin, (2001). (2001)

[12] Toerker M, Eritt M, May C, Amelung J, Luber C, Hermann R, Zschippang C, Tomita Y, Leo K, Proc. SID International Symposium, 37(2), 1471 (2006)

[13] Goushi K, Kawamura Y, Sasabem H, Adachi C, Jpn. J. of. Appl. Phys. Lett., 43, L937 (2004)

[14] Chen BJ, Sun XW, Sarma KR, Mat. Sci. Eng. B., 139, 192 (2007)

[15] Kajii H, Sekimoto Y, Hino Y, Ohmori Y, Thin Solid Films, 516, 2272 (2008)