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US 5,874,803 AGranted
Light emitting device with stack of OLEDS and phosphor downconverter
AssigneeThe Trustees of Princeton University
InventorsDmitri Z. Garbuzov, Stephen R. Forrest, Paul Burrows
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Abstract
Monochromatic and multicolor light emitting devices which make use of phosphor layers to downconvert light emitted from organic light emitting materials into different, more desired colors. The light emitting devices of the present invention are used in a variety of applications to provide displays with high brightnesses and efficiencies.
Claims41
A light emitting device comprising:
- a substrate;
- a plurality of organic light emitting layers in a stacked arrangement over said substrate;
- and
- a downconversion phosphor layer disposed between any two of said plurality of organic light emitting layers.
1 more element
A light emitting device, comprising:
- a transparent substrate;
- a first blue organic light emitting layer over said substrate;
- a green organic light emitting layer over said first blue organic light emitting layer;
- a filter structure over said green organic light emitting layer, said filter structure comprising a multilayer stack of at least one dielectric material, said filter structure allowing the passage of red light and blocking the passage of blue and green light;
- a red downconversion phosphor layer over said filter structure;
- and
- a second blue organic light emitting layer over said red downconversion phosphor layer.
4 more elements
A light emitting device, comprising:
- a transparent substrate;
- a first blue organic light emitting layer over said substrate;
- a first filter structure over said first blue organic light emitting layer, said filter structure comprising a multilayer stack of at least one dielectric material, said filter structure allowing the passage of red and green light and blocking the passage of blue light;
- a green downconversion phosphor layer over said first filter structure;
- a second blue organic light emitting layer over said green downconversion phosphor layer;
- a filter structure over said second blue organic light emitting layer, said filter structure comprising a multilayer stack of at least one dielectric material, said filter structure allowing the passage of red light and blocking the passage of blue and green light;
- a red downconversion phosphor layer over said filter structure;
- and
- a third blue organic light emitting layer over said red downconversion phosphor layer.
6 more elements
Dependencies are inferred from the claim text.