Efficient organic light-emitting diodes using hole-injection buffer layer
We have investigated the effects of hole-injection buffer layer in organic light-emitting diodes using copper phthalocyanine (CuPc), poly(vinylcarbazole)(PVK), and Poly(3,4-ethylene dioxythiophene):poly(styrenesulfonate) (PEDOT: PSS) in a device structure of ITO/buffer/TPD/Alq 3 /Al. Polymer PVK and...
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Published in | Journal of Information Display Vol. 4; no. 1; pp. 29 - 33 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English Korean |
Published |
Taylor & Francis Group
01.01.2003
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Subjects | |
Online Access | Get full text |
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Summary: | We have investigated the effects of hole-injection buffer layer in organic light-emitting diodes using copper phthalocyanine (CuPc), poly(vinylcarbazole)(PVK), and Poly(3,4-ethylene dioxythiophene):poly(styrenesulfonate) (PEDOT: PSS) in a device structure of ITO/buffer/TPD/Alq
3
/Al. Polymer PVK and PEDOT:PSS buffer layer were produced using the spin casting method where as the CuPc layer was produced using thermal evaporation. Current-voltage characteristics, luminance-voltage characteristics and efficiency of device were measured at room temperature at various a thickness of the buffer layer. We observed an improvement in the external quantum efficiency by a factor of two, four, and two and half when the CuPc, PVK, and PEDOT:PSS buffer layer were used, respectively. The enhancement of the efficiency is assumed to be attributed to the improved balance of holes and elelctrons resulting from the use of hole-injection buffer layer. The CuPc and PEDOT:PSS layer function as a hole-injection supporter and the PVK layer as a hole-blocking one. |
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Bibliography: | KISTI1.1003/JNL.JAKO200324282636092 |
ISSN: | 1598-0316 2158-1606 |
DOI: | 10.1080/15980316.2003.9651910 |