US2006194077A1PendingUtilityA1

Organic light emitting diode and display using the same

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Assignee: FUJI PHOTO FILM CO LTDPriority: Feb 28, 2005Filed: Feb 28, 2006Published: Aug 31, 2006
Est. expiryFeb 28, 2025(expired)· nominal 20-yr term from priority
Inventors:Takafumi NoguchiMasayuki Mishima
Y10T428/24942H10K 50/11H10K 85/615H10K 85/649H10K 85/324H10K 85/631H10K 85/342
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Claims

Abstract

An organic light emitting diode comprising a pair of electrodes and a stack including a hole transport layer, a light emitting layer, and an electron transport layer, the stack being intermediate between the electrodes, the light emitting layer being of a material having hole mobility and electron mobility equal to or lower than hole mobility of the hole transport layer and electron mobility of the electron transport layer, respectively.

Claims

exact text as granted — not AI-modified
1 . An organic light emitting diode comprising a pair of electrodes and a stack including a hole transport layer, a light emitting layer, and an electron transport layer, the stack being intermediate between the electrodes, 
 wherein the organic light emitting diode satisfies the following relationships:      1≦μ( h 1)/μ( h 2)≦10 4    1≦μ( e 1)/μ( e 2)≦10 4      wherein μ(h 1 ) is hole mobility of the hole transport layer; μ(e 1 ) is electron mobility of the electron transport layer; μ(h 2 ) is hole mobility of the light emitting layer; and μ(e 2 ) is electron mobility of the light emitting layer; each of μ(h 1 ), μ(e 1 ), μ(h 2 ), and μ(e 2 ) being for an applied electric field of 10 6  V/cm.    
     
     
         2 . An organic light emitting diode comprising a pair of electrodes and a stack including a hole transport layer, a light emitting layer, and an electron transport layer, the stack being intermediate between the electrodes, the light emitting layer being of a material having hole mobility and electron mobility equal to or lower than hole mobility of the hole transport layer and electron mobility of the electron transport layer, respectively, 
 wherein the organic light emitting diode satisfies the relationship: 0.1≦μ(e 2 )/μ(h 2 )≦10.    
     
     
         3 . An organic light emitting diode comprising a pair of electrodes and a stack including a hole transport layer, a light emitting layer, and an electron transport layer, the stack being intermediate between the electrodes, the light emitting layer being of a material having hole mobility and electron mobility equal to or lower than hole mobility of the hole transport layer and electron mobility of the electron transport layer, respectively, 
 wherein the organic light emitting diode satisfies the relationship: 0.1≦μ(e 1 )/μ(h 1 )≦10.    
     
     
         4 . The organic light emitting diode as claimed in  claim 1 , wherein the light emitting layer is of a material having hole mobility and electron mobility in equilibrium.  
     
     
         5 . The organic light emitting diode as claimed in  claim 2 , wherein the light-emitting layer is of a material having hole mobility and electron mobility in equilibrium.  
     
     
         6 . The organic light emitting diode as claimed in  claim 3 , wherein the light emitting layer is of a material having hole mobility and electron mobility in equilibrium.  
     
     
         7 . The organic light emitting diode as claimed in  claim 1 , wherein a balance of electron supply and hole supply to the light emitting layer is in equilibrium.  
     
     
         8 . The organic light emitting diode as claimed in  claim 2 , wherein a balance of electron supply and hole supply to the light emitting layer is in equilibrium.  
     
     
         9 . The organic light emitting diode as claimed in  claim 3 , wherein a balance of electron supply and hole supply to the light emitting layer is in equilibrium.  
     
     
         10 . The organic light emitting diode as claimed in  claim 1 , wherein the light emitting layer contains a hole transport material and an electron transport material.  
     
     
         11 . The organic light emitting diode as claimed in  claim 2 , wherein the light emitting layer contains a hole transport material and an electron transport material.  
     
     
         12 . The organic light emitting diode as claimed in  claim 3 , wherein the light emitting layer contains a hole transport material and an electron transport material.  
     
     
         13 . The organic light emitting diode as claimed in claim  10 , wherein the electron transport material is an aromatic heterocyclic compound having at least one hetero atom in the molecule thereof.  
     
     
         14 . The organic light emitting diode as claimed in  claim 11 , wherein the electron transport material is an aromatic heterocyclic compound having at least one hetero atom in the molecule thereof.  
     
     
         15 . The organic light emitting diode as claimed in  claim 12 , wherein the electron transport material is an aromatic heterocyclic compound having at least one hetero atom in the molecule thereof.  
     
     
         16 . The organic light emitting diode as claimed in  claim 13 , wherein the light emitting layer contains at least one of the same electron transport material as the electron transport layer and the same hole transport material as the hole transport layer.  
     
     
         17 . The organic light emitting diode as claimed in  claim 14 , wherein the light emitting layer contains at least one of the same electron transport material as the electron transport layer and the same hole transport material as the hole transport layer.  
     
     
         18 . The organic light emitting diode as claimed in  claim 15 , wherein the light emitting layer contains at least one of the same electron transport material as the electron transport layer and the same hole transport material as the hole transport layer.  
     
     
         19 . The organic light emitting diode as claimed in  claim 1 , wherein the light emitting layer contains a phosphorescent material.  
     
     
         20 . The organic light emitting diode as claimed in  claim 2 , wherein the light emitting layer contains a phosphorescent material.  
     
     
         21 . The organic light emitting diode as claimed in  claim 3 , wherein the light emitting layer contains a phosphorescent material.  
     
     
         22 . A display having a display area comprising the organic light emitting diode as claimed in  claim 1 .  
     
     
         23 . A display having a display area comprising the organic light emitting diode as claimed in  claim 2 .  
     
     
         24 . A display having a display area comprising the organic light emitting diode as claimed in  claim 3.

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