Structural Effect of Polymeric Hole Transport Layer on Performance of Organic Electroluminescent Device

Yoon JH; Song MK; Oh SY; Choi JW; Rhee HW

Korea Polymer Journal, Vol.6, No.3, 275-279, August, 1998

Yoon JH, Song MK, Oh SY, Choi JW, Rhee HW

A series of polymer hole transport materials, poly[N-(p-diphenylamine)phenyl methacrylamide] (PDPMA), poly[N-(p-methyldiphenylamine)phenyl methacrylamide] (PMDPMA) and poly[N-(p-diphenylamine)phenyl methacrylamide] (PDPMA), were synthesized by radical polymerization and their structural effects on the performance of multilayer EL device were studied. Among them PMoDPMA showed the lowest oxidation potential (1.11V) due to its high electron donating property. Thermal stability of PDPMA and its derivatives, and their resistance to oxygen and moisture were much better than organic hole transport material. Electroluminescent devices using them emitted blue light with high brightness of ∼650 cd/㎡ and showed better stability over long cycles than using low molecular weight hole transport materials. Also, PMoDPMA dramatically lowered the drving voltage of the device to 4 V, which was consistent with oxidation potential measurement.

[References]

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

[2] Burroughes JH, Bradley DDC, Brown AR, Marks RN, Mackay K, Friend RH, Burn PL, Holmes AB, Nature, 347, 539 (1990)

[3] Heeger AJ, Cao Y, Pei Q, Yu G, Yang Y, Zhang C, Abs. Pap. Am. Chem. Soc., 211, 202 (1996)

[4] Braun D, Heeger AJ, Appl. Phys. Lett., 58, 1982 (1991)

[5] Parker ID, J. Appl. Phys., 75, 1656 (1994)

[6] Egusa S, Miura A, Gemma N, Azuma M, Jpn. J. Appl. Phys., 33, 2741 (1994)

[7] Strukelj M, Jordan RH, Dodabalapur A, J. Am. Chem. Soc., 118(5), 1213 (1996)

[8] Suzuki H, Hoshino S, J. Appl. Phys., 79, 858 (1996)

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

[10] Salaneck WR, Logdlund M, Birgersson J, Lazzaroni R, Bredas JL, Synth. Met., 85, 1219 (1997)

[11] Phillips D, Polymer Photophysics, Chapman and Hall Press, NY (1985)

[12] Adachi C, Tsutsui T, Saito S, Appl. Phys. Lett., 55(15), 1489 (1989)

[13] Adachi C, Tsutsui T, Saito S, Appl. Phys. Lett., 56(9), 799 (1990)

[14] Adachi C, Tsutsui T, Saito S, Appl. Phys. Lett., 57(6), 531 (1990)

[15] Kido J, Nagai K, Okamoto Y, Skotheim T, Appl. Phys. Lett., 59(21), 2760 (1991)

[16] Shirota Y, Kuwabara Y, Inada H, Wakimoto T, Nakada H, Yonemoto Y, Kawami S, Imai K, Appl. Phys. Lett., 65(7), 807 (1994)