Organic light-emitting element

Abstract

An organic light-emitting device having a perovskite layer having a thickness of 50 nm or more has a low drive voltage and a high power efficiency, and can suppress interelectrode short-circuiting and current leakage.

1 . An organic light-emitting device having a perovskite layer having a thickness of 50 nm or more. 
     
     
         2 . The organic light-emitting device according to  claim 1 ,
 wherein the carrier mobility of the perovskite layer is 10 −2  to 10 3  cm 2 V −1 s −1 .   
     
     
         3 . The organic light-emitting device according to  claim 1 , further having a light-emitting layer. 
     
     
         4 . The organic light-emitting device according to  claim 3 , having at least two the perovskite layers, and having a structure that the light-emitting layer is sandwiched between the two perovskite layers. 
     
     
         5 . The organic light-emitting device according to  claim 3 , wherein the perovskite layer does not have a maximum absorption wavelength in an emission wavelength range of the light-emitting layer. 
     
     
         6 . The organic light-emitting device according to  claim 1 , wherein the perovskite layer contains a perovskite-type compound represented by the following general formula (4):
   A 3 BX 3   (4)
   
       wherein A 3  represents an organic cation, B represents a divalent metal ion, X represents a halogen ion, and three X's may be the same as or different from each other. 
     
     
         7 . The organic light-emitting device according to  claim 1 , wherein the perovskite layer is a vapor-deposited film. 
     
     
         8 . The organic light-emitting device according to  claim 7 , wherein the thickness of the perovskite layer is at least 100 nm. 
     
     
         9 . The organic light-emitting device according to  claim 1 , which is an organic electroluminescent device. 
     
     
         10 . The organic light-emitting device according to  claim 9 , having an anode and a cathode, a light-emitting layer arranged between the anode and the cathode, a first perovskite layer arranged between the anode and the light-emitting layer, and a second perovskite layer arranged between the cathode and the light-emitting layer, wherein the first perovskite layer and the second perovskite layer are perovskite layers each having a thickness of 50 nm or more. 
     
     
         11 . The organic light-emitting device according to  claim 10 , further having a hole injection layer arranged between the anode and the first perovskite layer and an electron injection layer arranged between the cathode and the second perovskite layer. 
     
     
         12 . The organic light-emitting device according to  claim 1 , wherein the thickness of the perovskite layer is at least 250 nm. 
     
     
         13 . The organic light-emitting device according to  claim 9 , having an anode and a cathode, a light-emitting layer arranged between the anode and the cathode, and
 having a layer containing Cs and the perovskite layer in this order from the cathode between the cathode and the light-emitting layer.