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Microcavity oleds for lighting

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Microcavity oleds for lighting


Various methods and systems are provided for related to organic light emitting diodes (OLEDs) having a microcavity. In one embodiment, a white-light source includes a first microcavity organic light emitting diode (OLED) configured to emit a narrow spectrum of blue light; a second microcavity OLED configured to emit a narrow spectrum of green light, and a third microcavity OLED configured to emit a narrow spectrum of red light. In another embodiment, a light source includes a plurality of OLEDs disposed on a glass substrate. Each of the OLEDs is configured to emit light in substantially orthogonal to the glass substrate in a predefined spectrum. Each of the OLEDs includes a semi-reflecting mirror; and an emitting layer, where the emitting layer in each OLED corresponds to a respective color of light emitted by the OLED.
Related Terms: Glass Diode Lighting

Browse recent University Of Florida Research Foundation, Inc. patents - Gainesville, FL, US
USPTO Applicaton #: #20130328029 - Class: 257 40 (USPTO) - 12/12/13 - Class 257 
Active Solid-state Devices (e.g., Transistors, Solid-state Diodes) > Organic Semiconductor Material

Inventors: Franky So

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The Patent Description & Claims data below is from USPTO Patent Application 20130328029, Microcavity oleds for lighting.

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CROSS REFERENCE TO RELATED APPLICATIONS

This application is a divisional application of U.S. application Ser. No. 13/575,347, filed Jul. 26, 2012, which is the 35 U.S.C. §371 national stage of PCT application PCT/US2011/025667, filed Feb. 22, 2011, which claims priority to and the benefit of U.S. provisional application entitled “MICROCAVITY OLEDS FOR LIGHTING” having Ser. No. 61/307,191, filed Feb. 23, 2010, all of which are hereby incorporated by reference in their entirety.

BACKGROUND

A broadband light source can be used to provide good quality lighting having a lighting spectrum that resembles natural sunlight. Light sources that do not provide light over the entire visible light spectrum can make the color of an object appear dull or even make the object appear to be a different color. For example, commercial fluorescent lights, which emit a limited amount of red light, can make an object appear to be dull red or even brown.

BRIEF DESCRIPTION OF THE DRAWINGS

Many aspects of the present disclosure can be better understood with reference to the following drawings. The components in the drawings are not necessarily to scale, emphasis instead being placed upon clearly illustrating the principles of the present disclosure. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views.

FIG. 1 is a graphical representation illustrating a non-limiting example of the transmission of emitted light through a plurality of layers of a white-emitting OLED in accordance with various embodiments of the present disclosure.

FIG. 2 is a graphical representation illustrating of the various modes of the plurality of layers of the white-emitting OLED of FIG. 1 in accordance with various embodiments of the present disclosure.

FIGS. 3 and 4 are graphical representations of examples of microcavity organic light emitting diodes (OLEDs) in accordance with various embodiments of the present disclosure.

FIGS. 5 and 6 are graphical representations of examples of semi-reflecting mirrors of the microcavity OLEDs of FIGS. 3 and 4 in accordance with various embodiments of the present disclosure.

FIGS. 7 and 8 are graphical representations illustrating non-limiting examples of the light intensity of a microcavity OLED of FIGS. 3 and 4 and an OLED that lacks a microcavity in accordance with various embodiments of the present disclosure.

FIG. 9 is a graphical representation of an example of a white-light emitting light source including a plurality of microcavity OLEDs of FIGS. 3 and 4 in accordance with various embodiments of the present disclosure.

FIG. 10 is a graphical representation illustrating a non-limiting example of the light intensity of the white-light emitting light source of FIG. 9 in accordance with various embodiments of the present disclosure.

FIG. 11 is a flow chart illustrating the fabrication of microcavity OLEDs of FIGS. 3 and 4 in accordance with various embodiments of the present disclosure.

DETAILED DESCRIPTION

Disclosed herein are various embodiments of a light source including one or more organic light emitting diodes (OLEDs) having a microcavity and methods of fabricating the same. Reference will now be made in detail to the description of the embodiments as illustrated in the drawings, wherein like reference numbers indicate like parts throughout the several views.

A microcavity OLED emits light substantially orthogonal to the OLED substrate. The microcavity of the OLED allows the OLED to be highly efficient and produce intense light because light emitted by the OLED is directed out of the OLED instead of allowing the emitted light to be retained within the OLED. Additionally, the present application describes a white light source including a plurality of microcavity OLEDs. In some embodiments, the white light source includes a microcavity OLED that emits intense red light in a narrow spectrum, microcavity OLED that emits intense green light in a narrow spectrum, and a microcavity OLED that emits intense blue light in a narrow spectrum. Since each microcavity OLED intensely emits the specific colors in a narrow spectrum, when the white light source illuminates an object, the visible colors reflected by the object may be vibrant and warm due to the intensity and the selection of bands of light emitted by the white light source.

A variety of light sources are available including luminaires using incandescent and/or fluorescent light bulbs. Luminaires are sometimes used in commercial, industrial, or office settings, and are often in the form of a light panel. Luminaires may lose 40-50% of the light they emit due to poor light extraction. Also, even if a light source such as a state of the art LED has a luminous efficacy of 100 lm/W (lumens per Watt), the efficacy of a luminaire may be as low as 40 lm/W.

The broader the band of light that a light source emits, the more the light emitted by the light source resembles sunlight. A figure of merit used in lighting is color rendering index (CRI). CRI is a quantitative measure of the ability of a light source to reproduce the colors of various objects in comparison with a natural light source, such as the sun. A broadband light source covering the entire visible spectrum has a CRI larger than 90. In contrast, a commercial fluorescent light tube, which emits a small amount of red light, has a CRI as low as 50. Because of this lack of red light, a red object appears to be dull red or even brown when illuminated by a commercial fluorescent light tube. White-emitting OLEDs are useful for lighting because organic materials have wide emission spectra. Combining red, green and blue emitters in a single OLED panel yields an OLED that has a CRI higher than 80 depending on the emission spectrum.

Some efficient white-emitting OLEDs have efficacies up to 100 lm/W. However, that requires exotic light extraction methods which are not practical for manufacturing. FIG. 1 is a diagram of a non-limiting example of the transmission of emitted light 102 through a plurality of layers of a white-emitting OLED 100. As can be seen in FIG. 1, because light emitted from the white-emitting OLED 100 is trapped due to refraction and reflection in an organic layer 104, an Indium Tin Oxide (ITO) layer 106, and/or a glass substrate 108, only a small fraction of the emitted light 102 is extracted into air 110. Examples of the indices of refraction (n) for the organic layers 104, the ITO layer 106, and the glass substrate 108 are also illustrated.



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Previous Patent Application:
Method of repairing short circuit defect, and display apparatus and organic light emitting display apparatus manufactured according to the repairing method
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Industry Class:
Active solid-state devices (e.g., transistors, solid-state diodes)
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stats Patent Info
Application #
US 20130328029 A1
Publish Date
12/12/2013
Document #
13963607
File Date
08/09/2013
USPTO Class
257 40
Other USPTO Classes
International Class
01L51/52
Drawings
8


Glass
Diode
Lighting


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