Saturated full color stacked organic light emitting devices
First Claim
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1. A stacked light emitting device comprising:
- a first light emitting device;
a first reflective layer arranged on the first light emitting device, the first reflective layer having a first reflectance;
a second light emitting device arranged over the first reflective layer; and
a second reflective layer arranged over the second light emitting device, the second reflective layer having a second reflectance,wherein the first and second reflective layers delimit an optical cavity, the optical cavity having a transmittance which dependant on the first and second reflectances and on an optical path length of the optical cavity, andwherein the optical path length and the first and second reflectances are selected so that the transmittance of the optical cavity has a predetermined characteristic.
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Abstract
Optical cavities in a stacked organic light emitting device (SOLEDS) can shift or attenuate the light emitted by the individual organic light emitting devices (OLEDs) in the stack. Interference caused by reflections within the stack, absorption, positioning of the light source, and the polarization of the emitted light can all determine how the spectra of the emitted light are affected by the SOLED structure. A detailed model that provides a good fit to measured SOLED emissions can be used to predict how a SOLED will affect light emitted by OLEDs. As a result, SOLED geometries that will optimize color saturation and external quantum efficiency can be predicted.
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Citations
27 Claims
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1. A stacked light emitting device comprising:
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a first light emitting device; a first reflective layer arranged on the first light emitting device, the first reflective layer having a first reflectance; a second light emitting device arranged over the first reflective layer; and a second reflective layer arranged over the second light emitting device, the second reflective layer having a second reflectance, wherein the first and second reflective layers delimit an optical cavity, the optical cavity having a transmittance which dependant on the first and second reflectances and on an optical path length of the optical cavity, and wherein the optical path length and the first and second reflectances are selected so that the transmittance of the optical cavity has a predetermined characteristic. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification