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

Claim 9:
10. The light-emitting device according to claim 1,
wherein the emission spectrum is obtained by measuring energy itself emitted from the emission center substance or by normalized spectrum that is proportional to the energy,
wherein Eave is estimated by the following formula (VI):, E
       
        a
        ⁢
        v
        ⁢
        e
       
      
      =
      
       
        
         ∅
         p
        
        
         N
         p
        
       
       =
       
        ch
        ·
        
         
          ∫
          
           
            
             ∅
             p
            
            (
            λ
            )
           
           ⁢
           d
           ⁢
           λ
          
         
         
          ∫
          
           
            
             ∅
             p
            
            (
            λ
            )
           
           ⁢
           
            λ
            ⁢
            d
           
           ⁢
            
           λ
          
         
        
       
      
     
     ,
    
   
   
    
     (
     VI
     )
    
   
  
 

wherein λ is wavelength,
wherein c is light speed,
wherein h is the Planck constant, and
wherein ϕp(λ) corresponds to the energy or a proportional value to the energy.