Optical Thin Films with Nano-Corrugated Surface Topologies by a Simple Coating Method
AssigneeOptimax Technology Corporation
InventorsXiaodong Wu, Arthur Jin-Ming Yang, Ruiyun Zhang
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Abstract
Embodiments of the invention relate to functionalized nanoparticle coating compositions. These coating can improve the light extraction efficiency of light emitting devices, including LEDs and OLEDs. In some embodiments, the coating can improve other properties such as anti-staining, abrasion and/or scratch resistance.
Claims29
A method for controlling surface corrugation on an emitting surface of a light-emitting device (LED) comprising applying to said surface a functional coating comprising nanoparticles having fluorinated organic functional groups bonded thereto.
A method for enhancing light extracting efficiency of a light emitting device, comprising applying to the emitting surface of an LED or an OLED device a coating comprising a precisely controlled corrugated surface, said coating comprising a functional coating comprising sol-gel nanoparticles having fluorinated organic functional groups bonded thereto.
A method for enhancing light extraction efficiency of a light emitting device, comprising applying inside the multilayer microcavity structure of an OLED device a coating comprising a precisely controlled corrugated surface, said coating comprising a functional coating comprising sol-gel nanoparticles having fluorinated organic functional groups bonded thereto and a conformal metal layer of thickness range of 5 to 50 nm.
A method for achieving a lotus-leaf effect on a substrate, comprising applying to said substrate a precisely controlled functional coating comprising nanoparticles having fluorinated organic functional groups bonded thereto.
A light-emitting element comprising:
- a light-emitting layer;
- and
- at least one light-extracting portion;
- wherein a part of the at least one-light extracting portion comprises surface corrugation with controlled length scale correlating with the desired light enhancement wavelength, wherein said surface corrugation comprises a self-assembled layer of nanoparticles with controlled size and having fluorinated organic functional groups bonded thereto to facilitate assembling at the surface layer.
A method for improving the light-emitting efficiency of a light-emitting device which includes (a) a substrate, (b) a first electrode disposed over the substrate, (c) an organic EL element disposed over the first electrode providing a light-emissive function for producing light, (d) a second electrode layer disposed over the EL layer, wherein at least one of the first and second electrodes may be transparent, wherein such light-emitting device could be a top-emitting, bottom-emitting or dual emitting LED depending on the choice of light output (transparent) sides;
- said method comprising applying to at least one of layers (a)-(d) a surface corrugated layer with a controlled length scale optimized for light extraction and comprising a self-assembled layer of nanoparticles having fluorinated organic functional groups bonded thereto and thereby providing the desired surface corrugation at the optimized length scale.
An enhanced light-emitting device comprising:
- (a) a transparent substrate;
- (b) a first electrode layer disposed over a first surface of the transparent substrate;
- (c) an EL layer element disposed over the first electrode providing a light-emissive function for producing light,
- (d) a second electrode layer disposed over the EL layer, and
- (e) a light enhancing layer comprising a layer having surface corrugation with a controlled and optimized length scale correlating with the wavelength of desired light enhancement, wherein said surface corrugation comprises a self-assembled layer of nanoparticles having fluorinated organic functional groups bonded thereto to thereby facilitate assembling at the surface layer and to accomplish the desired surface corrugation at the optimized length scale.
A structure capable of enhancing light output of a light emitting device, comprising a layer comprising surface corrugations with controlled length scale, wherein said surface corrugation comprises a self-assembled layer of nanoparticles having fluorinated organic functional groups bonded thereto and a thin metal layer disposed over the surface corrugations.
Dependencies are inferred from the claim text.