US2006267001A1PendingUtilityA1

Emission layer and organic light emitting diode using the same

44
Assignee: AU OPTRONICS CORPPriority: May 25, 2005Filed: Oct 4, 2005Published: Nov 30, 2006
Est. expiryMay 25, 2025(expired)· nominal 20-yr term from priority
Inventors:Min-Ling Hung
H10K 50/11
44
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Claims

Abstract

An emission layer of an organic light emitting diode (OLED) for emitting a white light includes a host material, a first luminescent dopant, and a second luminescent dopant. The host material has a peak emission wavelength of about 300 nm to about 530 nm. The first luminescent dopant has a peak emission wavelength of about 300 nm to about 530 nm. The second luminescent dopant has a peak emission wavelength of about 530 nm to about 720 nm.

Claims

exact text as granted — not AI-modified
1 . An emission layer of an organic light emitting diode (OLED), the emission layer comprising: 
 a host material having a peak emission wavelength of about 300 nm to about 530 nm;    a first luminescent dopant having a peak emission wavelength of about 300 nm to about 530 nm; and    a second luminescent dopant having a peak emission wavelength of about 530 nm to about 720 nm.    
   
   
       2 . The emission layer according to  claim 1 , wherein the doped ratio of the first luminescent dopant to the host material is substantially between 0.1 and 50 percent by volume.  
   
   
       3 . The emission layer according to  claim 2 , wherein a doped ratio of the second luminescent dopant to the host material is substantially between 0.01 and 5 percent by volume.  
   
   
       4 . The emission layer according to  claim 2 , wherein the doped ratio of the second luminescent dopant to the host material is substantially between 0.1 and 5 percent by volume.  
   
   
       5 . The emission layer according to  claim 1 , wherein a doped ratio of the first luminescent dopant to the host material is substantially between 0.01 and 50 percent by volume.  
   
   
       6 . The emission layer according to  claim 1 , wherein a doped ratio of the second luminescent dopant to the host material is substantially between 0.01 and 5 percent by volume.  
   
   
       7 . The emission layer according to  claim 1 , wherein the doped ratio of the second luminescent dopant to the host material is substantially between 0.1 and 5 percent by volume.  
   
   
       8 . The emission layer according to  claim 1 , wherein each of the first and second luminescent dopants has a molecular weight of less than about 1000.  
   
   
       9 . The emission layer according to  claim 1 , wherein each of the host material, the first and the second luminescent dopants has a molecular weight of less than about 1000.  
   
   
       10 . The emission layer according to  claim 1 , wherein the host material includes 2-methyl-9,10-di(2-naphthyl) anthracene (MADN).  
   
   
       11 . The emission layer according to  claim 1 , wherein the second luminescent dopant includes 
 4-(dicyanomethylene)-2-t-butyl-6-(1,1,7,7-tetramethyl-julolidyl-9-enyl)-4H-pyra n) (DCJTB).    
   
   
       12 . An emission layer of an organic light emitting diode (OLED), the emission layer comprising: 
 a host material having a peak emission wavelength of about 300 nm to about 530 nm; and    a luminescent dopant having a peak emission wavelength of about 530 nm to about 720 nm;    wherein a doped ratio of the luminescent dopant to the host material is substantially between 0.01 and 5 percent by volume.    
   
   
       13 . The emission layer according to  claim 12 , wherein each of the host material and the luminescent dopant has a molecular weight of less than about 1 000.  
   
   
       14 . The emission layer according to  claim 12 , wherein the host material includes 2-methyl-9,10-di(2-naphthyl) anthracene (MADN).  
   
   
       15 . The emission layer according to  claim 12 , wherein the second luminescent dopant includes 
 4-(dicyanomethylene)-2-t-butyl-6-( 1,1,7,7-tetramethyl-julolidyl-9-enyl)-4H-pyra n) (DCJTB).    
   
   
       16 . An organic light emitting diode (OLED) display panel comprising: 
 a first substrate assembly comprising:    a first substrate;    a cathode and an anode positioned relatively above the first substrate;    an emission layer disposed between the cathode and the anode, the emission layer comprising:    a host material having a peak emission wavelength of about 300 nm to about 530 nm; and    a luminescent dopant having a peak emission wavelength of about 530 nm to about 720 nm, a doped ratio of the luminescent dopant to the host material is substantially between 0.01 and 5 percent by volume;    a hole-transport layer disposed between the emission layer and the anode,    an electron-transport layer disposed between the emission layer and the cathode;    a second substrate assembly comprising at least one second substrate opposing to the first substrate assembly; and    an adhesive disposed between the first substrate and the second substrate.    
   
   
       17 . The OLED display panel according to  claim 16 , wherein each of the host material and the luminescent dopant has a molecular weight of less than about 1000.  
   
   
       18 . The OLED display panel according to  claim 16 , wherein the host material includes 2-methyl-9,10-di(2-naphthyl) anthracene (MADN).  
   
   
       19 . The OLED display panel according to  claim 16 , wherein the luminescent dopant includes 
 4-(dicyanomethylene)-2-t-butyl-6-(1,1,7,7-tetramethyl julolidyl-9-enyl)-4H-pyra n) (DCJTB).    
   
   
       20 . The OLED display panel according to  claim 16 , wherein the emission layer further comprises: 
 an additional luminescent dopant having a peak emission wavelength of about 300nm to about 530 nm.    
   
   
       21 . The OLED display panel according to  claim 20 , wherein a doped ratio of the additional luminescent dopant to the host material is substantially between 0.01 and 50 percent by volume.  
   
   
       22 . The OLED display panel according to  claim 16 , wherein the second substrate assembly further comprises a color filter disposed on the second substrate.  
   
   
       23 . An organic light emitting diode (OLED) comprising: 
 an electron-transport layer;    a hole-transport layer opposed to the electron-transport layer; and    an emission layer disposed between the electron-transport layer and the hole-transport layer, the emission layer comprising: 
 a host material;  
 a first luminescent dopant for emitting blue light; and  
 a second luminescent dopant for emitting red or yellow light;  
 wherein an absolute value of the highest occupied molecular orbital (HOMO) of the first luminescent dopant is less than or equal to that of the host material, and an absolute value of the lowest unoccupied molecular orbital (LUMO) of the first luminescent dopant is more than or equal to that of the host material.  
   
   
   
       24 . The OLED according to  claim 23 , wherein an absolute value of the HOMO of the second luminescent dopant is less than or equal to that of the first luminescent dopant, and an absolute value of the LUMO of the second luminescent dopant is more than or equal to that of the first luminescent dopant.  
   
   
       25 . The OLED according to  claim 23 , wherein the absolute value of the HOMO of the host material is more than or equal to that of the hole-transport layer, and the absolute value of the LUMO of the host material is less than or equal to that of the electron-transport layer.

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