Band edge emission enhanced organic light emitting diode-based devices that emit multiple light wavelengths
AssigneeRed Bank Technologies LLC
InventorsJohn N. Magno, Gene C. Koch
Life of this patent
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Abstract
Light emitting photonic crystals that comprise organic light emitting diodes and that are capable of emitting multiple wavelengths of light simultaneously and methods for fabricating the same are disclosed. Disclosed light emitting photonic crystals emit light at wavelengths at the two edges of a stop-band. Methods for adjusting the width of stop-bands of disclosed devices are also disclosed.
Claims12
A single light emitting photonic crystal having an organic electroluminescent emitter material disposed within the single photonic crystal, wherein
- the organic electroluminescent emitter material comprises an organic light emitting material localized in a zone having less than 10% of an optical thickness of the photonic crystal, wherein
- the organic electroluminescent emitter material has a free space emission spectrum that at least in part overlaps a stop-band of the photonic crystal, wherein
- the photonic crystal emits light at a wavelength corresponding to an edge of the stop-band that the organic electroluminescent emitter material overlaps, wherein
- the photonic crystal further comprises a stack of layers of varying refractive index, wherein
- a layer of lower index of refraction materials comprises the organic electroluminescent emitter material.
A light emitting device comprising a single light emitting photonic crystal of claim land further comprising one or more other light emitting photonic crystals each having photoluminescent material disposed within the single photonic crystal, wherein
- in each of the other single light emitting photonic crystals the organic photoluminescent material has a free space emission spectrum that at least in part overlaps the stop-band of that photonic crystal, wherein
- each of the other single light emitting photonic crystals emits light at a wavelength corresponding to the edge of a stop-band, wherein
- each of the other single light emitting photonic crystals has a periodically varying refractive index, and wherein
- emission of light from the one more other single light emitting photonic crystals is produced when light from the first single light emitting photonic crystal is absorbed by the photoluminescent emitter materials in those other single light emitting photonic crystals energizing them into photoluminescent light emission.
A single light emitting photonic crystal having an organic electroluminescent emitter material disposed within the single photonic crystal, comprising a stack of layers having a periodic modulation, measured in optical thickness, of refractive index with a period of modulation of λ/2, wherein λ equals the central wavelength of the photonic crystal stop-band, and an emitter configured to emit lights into one or more stop-bands thereby causing the single light emitting photonic crystal to emit light associated with two separate and distinct stop-band edges.
A single light emitting photonic crystal having an organic electroluminescent emitter material disposed within the single photonic crystal, comprising a stack of layers having a periodic modulation, measured in optical thickness, of refractive index with a period of modulation of λ/2, wherein λ equals the central wavelength of the photonic crystal stop-band, wherein the period of the refractive index modulation through the stack of layers is disrupted from between one to seven times by insertion of a layer of constant refractive index having an optical thickness equal to (2n+1)λ/4 wherein n is an integer between 1 and 3 and wherein λ is the central wavelength of the stop-band of the photonic crystal.
Dependencies are inferred from the claim text.