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1 2009

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The effect of DCJTB concentration on the photoluminescent and electroluminescent properties of PVK-PBD-perylene-DCJTB thin films

Cyap C. C., Yahaya M., Salleh M. M.

Materials Science Poland

2009

Vol. 27, No. 1

209--218

The paper reports a study of photoluminescent (PL) and electroluminescent (EL) properties of PVK- PBD-perylene-DCJTB thin film with variation of DCJTB doping concentrations. Poly(9-vinylcarbazole) (PVK) functioned as polymeric hole-transporting host, 2-(4-biphenylyl)-5-phenyl-1,3,4-oxadiazole (PBD) as electron-transporting molecule, perylene as blue dopant, and 4-(dicyanomethylene)-2-t-butyl-6(1,1,7,7- tetramethyljulolidyl-9-enyl)-4H-pyran (DCJTB) as a red dopant. The relative intensity of the blue emission from perylene decreased and that of the red emission from DCJTB increased with the increase of DCJTB concentration in both PL and EL spectra. However, the EL spectrum showed stronger DCJTB emission compared to the PL spectrum at the same DCJTB doping concentration, due to the carrier trapping effect. Interestingly, white light emission with C.I.E. coordinates of (0.31, 0.36) was observed in the EL spectrum when 0.05 wt. % of DCJTB was doped into PVK-PBD-perylene blend film. As a result, PVK-PBD-perylene-DCJTB thin film has potential application in white organic light emitting diodes.