banner image
No data available.
Please log in to see this content.
You have no subscription access to this content.
No metrics data to plot.
The attempt to load metrics for this article has failed.
The attempt to plot a graph for these metrics has failed.
High-electric-field quantum yield roll-off in efficient europium chelates-based light-emitting diodes
Rent this article for
View: Figures


Image of FIG. 1.
FIG. 1.

PL spectra of 6% [Eu1 (a) and Eu2 (b)]-doped (20%PC:74%TPD) 100 nm (Eu1)- and 120-nm-(Eu2)-thick films excited with light of wavelength 350 nm and intensity . EL spectra of Eu1 and Eu2 emitter-based LEDs: or or (c). The EL spectra were taken at . The molecular structures of Eu complexes used are indicated in the figure.

Image of FIG. 2.
FIG. 2.

(a) The external QE vs applied field, , characteristics of the 6% Eu-BrBM (Eu1) and 6% Eu-BDBBM (Eu2)-doped (20%PC:74%TPD) emitter devices as described in Fig. 3. The data for (, , 10-phenathroline) from Ref. 6 are given for comparison (uptriangles). The lines are the predictions of theory: Onsager 1934 model fit according to Eq. (2) with and (solid line); Onsager 1938 model fit for the pairs with the initial separation efficiency and the initial separation distance (dashed line); annihilation model fit according to Eq. (1) with (dotted line); and quenching model fit obtained by introducing in place of the in Eq. (1) an -dependent with a parameter (dash-dotted lines, upper- Eu1, lower- Eu2). (b) The corresponding current density plots of EL QE. Solid lines are model fits according to Eq (1) with (Eu1), (Eu2), and ( corresponds to in Refs. 6,9).

Image of FIG. 3.
FIG. 3.

vs representation of the current -field dependence given in the inset for the two LED structures described in the upper inset. The right-hand scale, , represents calculated from the expression for the hole SCLC with .


Article metrics loading...


Full text loading...

This is a required field
Please enter a valid email address
752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: High-electric-field quantum yield roll-off in efficient europium chelates-based light-emitting diodes