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Large electric field effects on photoluminescence of organic complex-based electroluminescent emitters
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View: Figures


Image of FIG. 1.
FIG. 1.

PL spectra of the Eu complexes studied: (a) (Eu1) phen-tris(di (bromo) benzoylmethane)mono(phenathroline)europium(III); (b) (Eu2) phen-tris (biphenoylmethane)mono(phenathroline)europium(III); (c) (Eu3) phen-tris (benzoylacetonato)mono(phenathroline)europium(III). The different coligands (; ; )were chosen to examine the coligand role for the EPLQ. The short-wavelength segments of the PL spectra are displayed in the insets. Due to the same ordinate scale in parts (a), (b), and (c), a relative decrease of the emission at the PL maximum may be observed for Eu3-based sample.

Image of FIG. 2.
FIG. 2.

Comparison of field dependencies of EPLQ for three different complex-doped EL emitters as indicated in parts (a), (b), and (c). Filled figures represent the values measured on Structure (A), open figures are the experimental data for Structure (B), and shadow points are calculated from . All data obtained with , and . The data of the EPL for the host fluorescence (TPD), , are displayed by crossed figures for comparison.

Image of FIG. 3.
FIG. 3.

Current-electric field characteristics of Structure (A) taken in the dark (filled points) and under illumination (photo) through the ITO anode (open points) in the (a) and (b) representations. Photocurrents were generated with light of and intensity . The straight lines are high-field fits to the data assuming SCLC conditions in (a) and (b) approximations. Their slopes give characteristic parameters for the approximations used. on the right-hand ordinate stands for the effective mobility calculated as .


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Large electric field effects on photoluminescence of organic Eu3+ complex-based electroluminescent emitters