Match List - I with List - II
List - I (Process) List - II (Definition)
A. Photoluminescence I. Excited carriers are created by high energy electron bombardment.
B. Electroluminescence II. Emission of photons for period up to second or minutes.
C. Cathodoluminescence III. Excitation of carriers by introduction of current.
D. Phosphorescence IV. Excitation of carriers by photo absorption.
Match List - I with List - II
List - I (Process) List - II (Definition)
A. Photoluminescence I. Excited carriers are created by high energy electron bombardment.
B. Electroluminescence II. Emission of photons for period up to second or minutes.
C. Cathodoluminescence III. Excitation of carriers by introduction of current.
D. Phosphorescence IV. Excitation of carriers by photo absorption.
Show Hint
- A-I, B-III, C-II, D-IV
- A-IV, B-II, C-III, D-I
- A-IV, B-III, C-I, D-II
- A-IV, B-II, C-I, D-III
The Correct Option is C
Solution and Explanation
Step 1: Match each process to its excitation source or characteristic.
• A. Photoluminescence: "Photo" implies light. Carriers are excited by absorbing photons. (Match with IV)
• B. Electroluminescence: "Electro" implies electricity. Light is emitted in response to an electric current or strong electric field. (Match with III)
• C. Cathodoluminescence: "Cathode" relates to electron beams (cathode rays). Carriers are excited by high-energy electron bombardment. (Match with I)
• D. Phosphorescence: A specific type of photoluminescence where the emission persists for a long time (seconds to minutes) after the excitation source is removed due to "forbidden" energy transitions. (Match with II)
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