US2005280020A1PendingUtilityA1

Visible light emitting diodes fabricated from soluble semiconducting polymers

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Assignee: UNIV CALIFORNIAPriority: Feb 27, 1991Filed: Feb 2, 2005Published: Dec 22, 2005
Est. expiryFeb 27, 2011(expired)· nominal 20-yr term from priority
Inventors:Alan J. HeegerDavid Braun
H10K 50/82H10K 71/191H10K 2102/311H10K 71/00H10K 50/805H10K 50/81H10K 50/11H10K 85/114H10K 50/868
52
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Claims

Abstract

Visible light LEDs are produced having a layer of conjugated polymer which is cast directly from solution or formed as a gel-processed admixture with a carrier polymer. The LEDs can be formed so as to emit polarized light.

Claims

exact text as granted — not AI-modified
1 - 47 . (canceled)  
     
     
         48 . A light-emitting diode which emits visible light and which has a quantum efficiency of at least 1%, comprising: 
 i) a substrate;    ii) a transparent conducting first layer coated onto said substrate, said first layer having high work function and serving as a hole-injecting electrode;    iii) a transparent layer of a soluble semiconducting luminescent conjugated polymer fabricated onto the transparent conducting first layer; and    iv) an electron-injecting contact fabricated from a low work function metal onto the semiconducting conjugated polymer layer.    
     
     
         49 . The light-emitting diode of  claim 48 , wherein the substrate is a transparent, inorganic substrate.  
     
     
         50 . The light-emitting diode of  claim 48 , wherein the substrate is a transparent, organic polymer substrate.  
     
     
         51 . The light-emitting diode of  claim 48 , wherein the conducting first layer is an electronegative metal.  
     
     
         52 . The light-emitting diode of  claim 48 , wherein the conducting first layer is a conductive metal-metal oxide mixture.  
     
     
         53 . The light-emitting diode of  claim 48 , wherein the semiconducting conjugated polymer layer comprises poly(2-methoxy,5-(2′-ethylhexyloxy)-1,4-phenylenevinylene).  
     
     
         54 . The light-emitting diode of  claim 48 , wherein the low work function metal is calcium.  
     
     
         55 . The light-emitting diode of  claim 48 , wherein the semiconducting conjugated polymer layer comprises a semiconducting conjugated polymer selected from the group consisting of soluble alkoxy derivatives of poly(phenylenevinylene).  
     
     
         56 . The light-emitting diode of  claim 48 , wherein the conducting first layer comprises gold or silver.  
     
     
         57 . The light-emitting diode of  claim 48 , wherein the conducting first layer comprises indium-tin oxide.  
     
     
         58 . The light-emitting diode of  claim 48 , wherein the substrate comprises an organic polymer selected from the group consisting of polyesters, polycarbonates, polyacrylates, and polystyrenes.  
     
     
         59 . The light-emitting diode of  claim 48 , wherein the low work function metal is barium.  
     
     
         60 . A light-emitting diode which emits visible light and which has a quantum efficiency of at least 1%, comprising: 
 i) a substrate;    ii) a transparent conducting first layer coated onto said substrate, said first layer having high work function and serving as a hole-injecting electrode;    iii) a transparent layer of a soluble semiconducting luminescent conjugated polymer fabricated onto the transparent conducting first layer; and    iv) an electron-injecting contact fabricated from calcium or a lower work function alkaline earth metal onto the semiconducting conjugated polymer layer.    
     
     
         61 . The light-emitting diode of  claim 60 , wherein the substrate is a transparent, inorganic substrate.  
     
     
         62 . The light-emitting diode of  claim 60 , wherein the substrate is a transparent, organic polymer substrate.  
     
     
         63 . The light-emitting diode of  claim 60 , wherein the substrate comprises an organic polymer selected from the group consisting of polyesters, polycarbonates, polyacrylates, and polystyrenes.  
     
     
         64 . The light-emitting diode of  claim 60 , wherein the conducting first layer is a conductive metal-metal oxide mixture.  
     
     
         65 . The light-emitting diode of  claim 60 , wherein the conducting first layer comprises indium-tin oxide.  
     
     
         66 . The light-emitting diode of  claim 60 , wherein the conducting first layer is an electronegative metal.  
     
     
         67 . The light-emitting diode of  claim 60 , wherein the conducting first layer comprises gold or silver.  
     
     
         68 . The light-emitting diode of  claim 60 , wherein the semiconducting conjugated polymer layer comprises a semiconducting conjugated polymer selected from the group consisting of soluble alkoxy derivatives of poly(phenylenevinylene).  
     
     
         69 . The light-emitting diode of  claim 60 , wherein the semiconducting conjugated polymer layer comprises poly(2-methoxy,5-(2′-ethylhexyloxy)-1,4-phenylenevinylene).  
     
     
         70 . The light-emitting diode of  claim 60 , wherein the electron-injecting contact is calcium.  
     
     
         71 . The light-emitting diode of  claim 60 , wherein the electron-injecting contact is barium.

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