Patent ID: 11917840
Assignee: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  G | IPC H

Claim 8:
9. The light-emitting device according to claim 1,
wherein the emission spectrum is obtained by counting photons emitted from the emission center substance,
wherein Eave is estimated by the following formula (IV):, E
       ave
      
      =
      
       
        
         ∅
         p
        
        
         N
         p
        
       
       =
       
        ch
        ·
        
         
          ∫
          
           
            
             F
             ⁡
             (
             λ
             )
            
            /
            λ
           
           ⁢
           d
           ⁢
           λ
          
         
         
          ∫
          
           
            F
            ⁡
            (
            λ
            )
           
           ⁢
           d
           ⁢
           λ
          
         
        
       
      
     
     ,
    
   
   
    
     (
     IV
     )
    
   
  
 

wherein λ is wavelength,
wherein c is light speed,
wherein h is the Planck constant, and
wherein ∫F(λ)dλ corresponds to an integral value of the emission spectrum.