Transparent contacts for organic devices
First Claim
1. An energizable, light emitting structure, comprising:
- a substrate;
a first layer of transparent, electrically conductive material supported on said substrate;
a first transparent, energizable, light emitting device (LED1) deposited on said first layer of transparent, electrically conductive material, said LED1 including an emission layer of organic material and said LED1 being operative to produce light when energized;
a second layer of electrically conductive material deposited on said LED1, said second layer of electrically conductive material being substantially transparent;
a second transparent, energizable, light emitting device (LED2) deposited on said second layer of electrically conductive material, said LED2 including an emission layer of organic material, and said LED2 being operative to produce light when energized; and
a third layer of transparent electrically conductive material supported by said LED2.
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Abstract
A multicolor organic light emitting device employs vertically stacked layers of double heterostructure devices which are fabricated from organic compounds. The vertical stacked structure is formed on a glass base having a transparent coating of ITO or similar metal to provide a substrate. Deposited on the substrate is the vertical stacked arrangement of three double heterostructure devices, each fabricated from a suitable organic material. Stacking is implemented such that the double heterostructure with the longest wavelength is on the top of the stack. This constitutes the device emitting red light on the top with the device having the shortest wavelength, namely, the device emitting blue light, on the bottom of the stack. Located between the red and blue device structures is the green device structure. The devices are configured as stacked to provide a staircase profile whereby each device is separated from the other by a thin transparent conductive contact layer to enable light emanating from each of the devices to pass through the semitransparent contacts and through the lower device structures while further enabling each of the devices to receive a selective bias. The devices are substantially transparent when de-energized, making them useful for heads-up display applications.
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Citations
17 Claims
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1. An energizable, light emitting structure, comprising:
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a substrate; a first layer of transparent, electrically conductive material supported on said substrate; a first transparent, energizable, light emitting device (LED1) deposited on said first layer of transparent, electrically conductive material, said LED1 including an emission layer of organic material and said LED1 being operative to produce light when energized; a second layer of electrically conductive material deposited on said LED1, said second layer of electrically conductive material being substantially transparent; a second transparent, energizable, light emitting device (LED2) deposited on said second layer of electrically conductive material, said LED2 including an emission layer of organic material, and said LED2 being operative to produce light when energized; and a third layer of transparent electrically conductive material supported by said LED2. - View Dependent Claims (2, 3, 4)
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5. A multicolor light emitting device structure comprising:
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a substrate layer having deposited on a surface a first transparent electrically conductive coating; a first light emitting device deposited on said first transparent electrically conductive coating; a second transparent electrically conductive coating deposited on the surface of said first device not in contact with said first coating; a second light emitting device deposited on the surface of said second coating; a third transparent electrically conductive coating deposited on the surface of said second device not in contact with said second coating; a third light emitting device deposited on the surface of said third coating;
said first, second, and light emitting devices each including an organic emission layer for emitting light of a desired color, respectively; anda fourth electrically conductive coating deposited on the surface of said third device not in contact with said third coating. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification