고분자 정공 전달체로서 PDPMA LB 필름관 Alq<sub>3</sub>로 구성된는 유기 발광소자의 특성

오세용; 김형민; 이창호; 최정우; 이희우; 김형수; Se Young Oh; Hyung Min Kim; Chang Ho Lee; Jung Woo Choi; Hee Woo Rhee; Hyung Su Kim

Polymer(Korea), Vol.24, No.1, 90-96, January, 2000

고분자 정공 전달체로서 PDPMA LB 필름관 Alq₃로 구성된는 유기 발광소자의 특성

Characteristics of Organic Electroluminescent Device Consisting of PDPMA LB Film as a Polymer Hole Transport Material and Alq₃

오세용^†, 김형민, 이창호, 최정우, 이희우, 김형수¹

서강대학교 공과대학
¹단국대학교 공과대학 화학공학과

Se Young Oh^†, Hyung Min Kim, Chang Ho Lee, Jung Woo Choi, Hee Woo Rhee, and Hyung Su Kim¹

Department of Chemical Engineering, Sogang University, Seoul 121-742, Korea
¹Department of Chemical Engineering, Dankook University, Seoul 140-714, Korea

E-mail:

초록

고분자 정공 전달체로 LB 기법에 의해 제조한 PDPMA 초박막과 발광층으로 Alq₃를 사용하여 유기 발광소자를 제작하였다. 표면 활성제로 arachidic acid를 사용하여 안정한 PDPMA 단분자막을 얻을 수 있었다. PDPMA LB 필름의 두께와 320mm의 최대 흡광도는 층수의 증가에 따라 거의 선형적으로 증가하였다. ITO/PDPMA LB 필름(19층)/Alq₃/Al으로 구성된 유기 적층형 소자는 DC 14V에서 2500cd/m²의 높은 휘도를 갖는 녹색 빛을 발광하였다. 특히 PDPMA LB 필름의 층이 15로 이루어진 발광소자의 구동전압은 4 V의 매우 낮은 값을 나타내었다. PDPMA LB 필름의 두께 조절 및 분자 배향에 따른 EL 성능에 미치는 영향에 관하여도 검토하였다.

Organic electroluminescent(EL) device was fabricated with alq₃ as an emitting material and PDPMA ultra thin film prepared by Langmuir-Boldgett technique as a polymer hole transport layer. A stable condensed PDPMA monolayer was obtained using arachidic acid as a surface active material. The thickness and adsorbace of PDPMA LB film increased line-arly with the layer numbers. The organic multilayered device consisted of ITO/PDPMA LB film(19 layers)/Alq₃/Ai emitted green light with grightness of 2500 cd/m₃ at a DC 14V. Especially, the drive voltage of EL device having PDPMA LB film of 15 layers exhibited the value as low as 4V. The effects of thickness control and molecular orientation in the PDPMA LB film on EL performance were discussed.

Keywords:EL device;PDPMA LB film;thickness control;molecular orientation;EL performance

[References]

Freeman DC, White CE, J. Am. Chem. Soc., 78, 2678 (1956)
Tang CW, Vanslyke SA, Appl. Phys. Lett., 51, 913 (1987)
Johnson GE, Mcgrane KM, Stolka M, Pure Appl. Chem., 67, 175 (1995)
Kim DU, Tsutsui T, Saito S, Chem. Lett., 7, 587 (1995)
Wu AP, Jikei M, Kakimoto M, Imai Y, Ukishima S, Takahashi Y, Chem. Lett., 12, 2319 (1994)
Williams G, Moore AJ, Bryce MR, Petty MC, Thin Solid Films, 244(1-2), 936 (1994)
Tsutsui T, Takada N, Saito S, Ogino E, Appl. Phys. Lett., 65, 1868 (1994)
Berggren M, Gustafsson G, Inganas O, Anderson MR, Hjertberg T, Wennerstrom O, J. Appl. Phys., 76, 7530 (1994)
Sokolik I, Yang Z, Karasz FE, Morton DC, J. Appl. Phys., 74, 3584 (1993)
Kido J, Hayase H, Hongwa K, Nagai K, Okuyama K, Appl. Phys. Lett., 65, 2124 (1994)
Adachi C, Tsutsui T, Saito S, Appl. Phys. Lett., 55, 1489 (1989)
Hamada Y, Adachi C, Tsutsui T, Saito S, Jpn. J. Appl. Phys., 31, 1812 (1992)
Song MK, Yoon JH, Kim KH, Choi YJ, Oh SY, Rhee HW, Mol. Cryst. Liq. Cryst., 316, 293 (1998)
Oh SY, Choi YJ, Lee CH, Yoon JH, Choi JW, Kim HS, Rhee HW, HWAHAK KONGHAK, 36(5), 713 (1998)
Wu A, Fujuwara T, Jikei M, Kakimoto MA, Imai Y, Kubota T, Iwamoto M, Thin Solid Films, 284, 901 (1996)

[Referenced By]

[1] Freeman DC, White CE, J. Am. Chem. Soc., 78, 2678 (1956)

[2] Tang CW, Vanslyke SA, Appl. Phys. Lett., 51, 913 (1987)

[3] Johnson GE, Mcgrane KM, Stolka M, Pure Appl. Chem., 67, 175 (1995)

[4] Kim DU, Tsutsui T, Saito S, Chem. Lett., 7, 587 (1995)

[5] Wu AP, Jikei M, Kakimoto M, Imai Y, Ukishima S, Takahashi Y, Chem. Lett., 12, 2319 (1994)

[6] Williams G, Moore AJ, Bryce MR, Petty MC, Thin Solid Films, 244(1-2), 936 (1994)

[7] Tsutsui T, Takada N, Saito S, Ogino E, Appl. Phys. Lett., 65, 1868 (1994)

[8] Berggren M, Gustafsson G, Inganas O, Anderson MR, Hjertberg T, Wennerstrom O, J. Appl. Phys., 76, 7530 (1994)

[9] Sokolik I, Yang Z, Karasz FE, Morton DC, J. Appl. Phys., 74, 3584 (1993)

[10] Kido J, Hayase H, Hongwa K, Nagai K, Okuyama K, Appl. Phys. Lett., 65, 2124 (1994)

[11] Adachi C, Tsutsui T, Saito S, Appl. Phys. Lett., 55, 1489 (1989)

[12] Hamada Y, Adachi C, Tsutsui T, Saito S, Jpn. J. Appl. Phys., 31, 1812 (1992)

[13] Song MK, Yoon JH, Kim KH, Choi YJ, Oh SY, Rhee HW, Mol. Cryst. Liq. Cryst., 316, 293 (1998)

[14] Oh SY, Choi YJ, Lee CH, Yoon JH, Choi JW, Kim HS, Rhee HW, HWAHAK KONGHAK, 36(5), 713 (1998)

[15] Wu A, Fujuwara T, Jikei M, Kakimoto MA, Imai Y, Kubota T, Iwamoto M, Thin Solid Films, 284, 901 (1996)