LI Feng, ZHANG Xiu-feng, FENG Jing, CHENG Gang, WU Zhi-jun, LIU Shi-yong, ZHANG Li-gong, SONG Ke-fei, LIN Jiu-ling. Red Organic Light-Emitting Diodes Doped with Two Guest Dyes[J]. Chinese Journal of Luminescence, 2003,24(6): 592-598
LI Feng, ZHANG Xiu-feng, FENG Jing, CHENG Gang, WU Zhi-jun, LIU Shi-yong, ZHANG Li-gong, SONG Ke-fei, LIN Jiu-ling. Red Organic Light-Emitting Diodes Doped with Two Guest Dyes[J]. Chinese Journal of Luminescence, 2003,24(6): 592-598DOI:
We report the red organic light-emitting diodes doped with rubrene and 4-(dicyanomethylene)-2-t-butyl-6-(1
1
7
7-tetramethyljulolidyl-9-enyl)-4H-pyran (DCJTB).N
N’-diphenyl-N
N’-bis(1-naph-thyl)-(1
1’-biphenyl)-4
4’-diamine (NPB) and doped tri-(8-hydroxyquinoline)aluminum(Alq
3
) are used as hole and electron-transport layers
respectively.The performances of the co-doped diodes were found to be improved compared to the only DCJTB doped diodes.We attribute the improvement to rubrene which assists the energy transfer from Alq
3
to DCJTB more efficiently.The energy transfer rates from Alq
3
to DCJTB
from Alq
3
to rubrene
and from rubrene to DCJTB are proximately calculated to be 1.04×10
9
3.89×10
9
2.79×109s
-1
according to the fit of the fluorescence decay curves
respectively.It can be seen clearly that the energy transfer rate from Alq
3
to DCJTB through rubrene is 2.7 times higher than that from Alq