Luminescence of Rubrene and DCJTB molecules in organic light-emitting devices

We investigated the optical properties of light emission based on the resonance energy transfer mechanism between two molecules in the host–dopant systems. For this purpose, we fabricated the organic light-emitting devices with the different doped emissive layers. The host matrices were made of 4,4′...

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Bibliographic Details
Published in:Journal of luminescence 2014-02, Vol.146, p.314-320
Main Authors: Moon, Chang-Bum, Song, Wook, Meng, Mei, Kim, Nam Ho, Yoon, Ju-An, Kim, Woo Young, Wood, Richard, Mascher, Peter
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Conductivity
Current density
Devices
Dopants
Electroluminescence
Energy transfer
Exact sciences and technology
Excitation spectra
Gaussian
Luminescence
Molecular energy levels
Optical properties
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Organic light emitting devices (OLEDs)
Organic light emitting diodes
Other luminescence and radiative recombination
Physics
Resonance energy transfer
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Summary:We investigated the optical properties of light emission based on the resonance energy transfer mechanism between two molecules in the host–dopant systems. For this purpose, we fabricated the organic light-emitting devices with the different doped emissive layers. The host matrices were made of 4,4′,4″-tris(carbasol-l-nyl)triphenylamine (TCTA) and 2-methyl-9,10-di(2-naphthyl)anthracene (MADN) molecules and the doped molecules were 5,6,11,12-tetraphenylnaphtacene (Rubrene) and 4-(Dicyanomethylene)-2-tert-butyl-6-(1,1,7,7-tetramethyljulolidin-4-yl-vinyl)-4H-pyran (DCJTB). The concentrations of the doped molecules were 0.1%, 0.3%, 0.5%, and 0.8%. Through spectroscopic analysis using multi-peak fits with a Gaussian function to the emission spectra, we obtained the relative light intensity of the two dopants according to the doping concentrations and examined the relations between the molecular excited energy states and the nature of energy transfer in the host and dopant systems. We show that the luminous efficiency of the devices has a strong correlation between the energy transfer owing to the individual molecular intrinsic properties and the electrical characteristics associated with the bulky properties in the devices. •Fabrication and characterization of the OLEDs with a host–dopant system in the emissive layer.•Investigation of the optical properties of light emission based on the resonance energy transfer mechanism between the dopant molecules.•EL and PL spectroscopic study for the structure of the molecular energy levels in the dopant molecules.
ISSN:0022-2313
1872-7883
DOI:10.1016/j.jlumin.2013.10.014