Organic light emitting device

Abstract

A method of forming a thin film includes preparing a mixture including a light emitting layer material that forms a light emitting layer and a material that forms a layer adjacent to the light emitting layer, and sequentially laminating the light emitting layer and the layer adjacent to the light emitting layer onto a substrate inside a chamber by heating the mixture to a process temperature of the light emitting layer material and a process temperature of the additional material. The light emitting layer material and the additional material have process temperatures that are different from each other. The light emitting layer material and the additional material are laminated onto the substrate sequentially from one of the light emitting layer material and the additional material having a lower process temperature to one of the light emitting layer material and the additional material having a higher process temperature.

What is claimed is: 
     
         1 . A mixture for depositing a thin film, the mixture comprising:
 a light emitting layer material for forming a light emitting layer of an organic light emitting device; and   an additional material for forming at least one layer to be adjacent to the light emitting layer,   wherein the light emitting layer material and the additional material have different process temperatures at which a vapor pressure within a chamber comes to equal a process pressure.   
     
     
         2 . The mixture for depositing a thin film as claimed in  claim 1 , wherein the additional material includes at least one selected from a hole injection layer material, a hole transport layer material, an electron transport layer material, and an electron injection layer material. 
     
     
         3 . The mixture for depositing a thin film as claimed in  claim 1 , wherein the additional material further includes at least one selected from an electron blocking layer material and a hole blocking layer material. 
     
     
         4 . The mixture for depositing a thin film as claimed in  claim 2 , wherein the additional material includes the electron transport layer material, the light emitting layer material, and the hole transport layer material. 
     
     
         5 . The mixture for depositing a thin film as claimed in  claim 4 , wherein:
 the electron transport layer material has a first process temperature, the light emitting layer material has a second process temperature, and the hole transport layer material has a third process temperature, and   wherein the first process temperature differs from the second process temperature and the second process temperature differs from the third process temperature by about 20-100° C.   
     
     
         6 . The mixture for depositing a thin film as claimed in  claim 1 , wherein the process pressure is about 10 −4 -10 −9  Torr. 
     
     
         7 . The mixture for depositing a thin film as claimed in  claim 2 , wherein the hole injection layer material and the hole transport layer material have process temperatures that enable codeposition of the hole injection layer material and the hole transport layer material while manufacturing an organic light emitting device. 
     
     
         8 . The mixture for depositing a thin film as claimed in  claim 1 , wherein the light emitting layer material includes a host material and a dopant material. 
     
     
         9 . The mixture for depositing a thin film as claimed in  claim 8 , wherein a process temperature of the host material and a process temperature of the dopant material differ from each other by not more than about 10° C. 
     
     
         10 . The mixture for depositing a thin film as claimed in  claim 1 , wherein at least one of the light emitting layer material and the additional material is selected based on a wavelength band of light emitted from the light emitting layer. 
     
     
         11 . The mixture for depositing a thin film as claimed in  claim 1 , further comprising:
 a heat conductor that delivers heat to the light emitting layer material and the additional material; and   a binder that links the light emitting layer material with the additional material.   
     
     
         12 . The mixture for depositing a thin film as claimed in  claim 1 , wherein the mixture for depositing a thin film has a tabular shape, a pellet shape, or a granular shape.