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Stacked white organic light emitting devices consisting of separate red, green, and blue elements
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Figures

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FIG. 1.

(a) Proposed energy-level diagram of the RGB SOLED. Numbers indicate the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energies relative to vacuum (in eV). The HOMO and LUMO energies of Fir6, , and PQIr are (6.1 and 3.1 eV), (5.1 and 2.6 eV) and (5.0 and 2.7 eV), respectively. Arrows indicate carrier injection from electrodes and the charge-generation layer. (b) Spectrum of the optically optimized B-G-R (with R adjacent to the ITO anode) ordered device (solid line) and spectrum of the R-G-B ordered structure in (a) (dashed line).

Image of FIG. 2.

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FIG. 2.

(a) Total EQE of the RGB SOLED (open circles) along with that for the monochrome control devices. The solid line is a fit to the SOLED EQE, which is the weighted sum of the monochrome device efficiencies. (b) Total power efficiencies of the RGB SOLED and the control devices. Arrows indicate values at a brightness of .

Image of FIG. 3.

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FIG. 3.

(a) Measured and simulated spectra of the RGB SOLED at several current densities. Simulated spectra are based on cavity enhancement and extraction efficiencies by fitting the ratios of photons generated from the constitutent R, G, and B elements. (b) Current-voltage characteristics of the RGB SOLED and the monochrome control devices. The solid line is the sum of the currents of the three control devices, which in the absence of losses, would be equal to the RGB SOLED characteristic.

Tables

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Table I.

IQEs and the ratio of photons generated from the elements in the RGB SOLED.

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/content/aip/journal/apl/93/19/10.1063/1.3021014
2008-11-13
2014-04-19

Abstract

We demonstrate a white organic light-emitting device where individual red, green, and blue (R, G, and B) phosphorescent organic light-emitting devices are vertically stacked and electrically interconnected by a compound -doped charge generation layer. For the order of B, G, and R cells positioned relative to the indium tin oxide anode, the device yields a peak total external quantum efficiency (EQE) and power efficiency (PE) of at a current density of and at , respectively. The EQE and PE of the device roll off to and at , corresponding to . At this luminance, the device shows Commission Internationale de L’Eclairage chromaticity coordinates of (0.45, 0.36) and a color rendering index of 63.

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Scitation: Stacked white organic light emitting devices consisting of separate red, green, and blue elements
http://aip.metastore.ingenta.com/content/aip/journal/apl/93/19/10.1063/1.3021014
10.1063/1.3021014
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