Opto Electronics » Exercise – 1
3. Photoluminescence which persists for some period after excitation is known as :
   (a) Phosphorescence
(a) Phosphorescence
   (b) Tri-luminescence
(b) Tri-luminescence
  (c) Fluorescence
(c) Fluorescence
  (d) Bioluminescence
(d) Bioluminescence
   
	
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