Broadband light emitting device with grating-structured electrode
a light emitting device and grating technology, applied in the direction of basic electric elements, semiconductor devices, electrical equipment, etc., can solve the problems of inefficient operation of the (o)led, large energy consumption of lighting systems, and large generation of light trapped in the devi
Active Publication Date: 2022-04-05
KONICA MINOLTA LAB U S A INC +1
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- Abstract
- Description
- Claims
- Application Information
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Benefits of technology
The invention is related to a light emitting device that includes a substrate layer, a first electrode layer, a light emitting layer, and a patterned second electrode layer. The patterned second electrode layer includes a periodic grating structure with a grating period less than or equal to 200 nm. The device also includes a broadband light emitting layer that emits a broadband light with a discrete spectral power distribution of multiple emission peaks at different wavelengths. The patterned second electrode layer has an optimized periodic grating structure that minimizes plasmonic loss at the same wavelengths as the multiple emission peaks.
Problems solved by technology
Energy consumption of lighting systems is presently a major societal concern.
This inefficiency is because much of the generated light becomes trapped in the device, e.g., due to total internal reflection at a layer interfaces as well as at output surface, in addition to absorption of the light by the metal electrode.
Among these many light loss channels, the plasmon loss (may also be termed “plasmonic loss”) may amount to about 40% of the total emitted light and thus, the elimination of plasmon loss represents an ongoing challenge in improving the light extraction of (O)LEDs.
Energy in the SPP waves is eventually absorbed by the metal electrode and thus leads to inefficient operation of the (O)LED.
However, existing grating structures are only effective for plasmon loss reduction in a very narrow wavelength range (i.e., monochromatic sources) and none are effective for broadband, i.e., white light, sources such as white OLEDs.
Method used
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[0022]Specific embodiments of the invention will now be described in detail with reference to the accompanying figures. Like elements in the various figures are denoted by like reference numerals for consistency. Further, the use of “Fig.” in the drawings is equivalent to the use of the term “Figure” in the description.
[0023]In the following detailed description of embodiments of the invention, numerous specific details are set forth in order to provide a more thorough understanding of the invention. However, it will be apparent to one of ordinary skill in the art that the invention may be practiced without these specific details. In other instances, well-known features have not been described in detail to avoid unnecessarily complicating the description.
[0024]In general, embodiments of the invention relate to a light emitting device with a periodic grating structure engineered to impair the formation of surface plasmon polariton waves across the entire range of the visible spectrum...
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Abstract
A light emitting device includes a substrate layer, a first electrode layer, a light emitting layer, and a patterned second electrode layer. The patterned second electrode layer includes a periodic grating structure having a grating period λg less than or equal to 200 nm and the patterned second electrode layer and the light emitting layer are separated by at most 100 nm.
Description
CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is a reissue application of U.S. Pat. No. 9,865,836, filed as U.S. patent application Ser. No. 16 / 199,607 on Jul. 9, 2018 as a national stage entry of International Patent Application No. PCT / US2014 / 065016, filed on Nov. 11, 2014, and claims priority from U.S. Provisional Patent Application No. 61 / 902,734, filed on Nov. 11, 2013.BACKGROUND[0002]Energy consumption of lighting systems is presently a major societal concern. This concern has even led to some governments to encourage the development of more energy efficient light sources and smart controls for those light sources. Some methods of improving light efficiency rely on improvements of the underlying materials and structures of the lighting devices themselves. Other methods involve designing customized spectral distributions that satisfy color quality and luminous efficacy. Still other methods require designing light management systems with sophisticated sensors and...
Claims
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IPC IPC(8): H01L27/32H01L51/52H01L51/50H01L33/38H01L33/50H01L33/40
CPCH01L51/5225H01L33/38H01L33/505H01L51/5056H01L51/5072H01L51/5268H01L51/5275H01L33/405H01L2933/0091H10K50/16H10K50/822H10K50/858H10K50/15H10K50/854
InventorWANG, LEIMINGBRONGERSMA, MARKESFANDYARPOUR, MAJIDAMANO, JUN
OwnerKONICA MINOLTA LAB U S A INC