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Chemistry: The Central Science | 13th Edition | ISBN: 9780321910417 | Authors: Theodore E. Brown; H. Eugene LeMay; Bruce E. Bursten; Catherine Murphy; Patrick Woodward; Matthew E. Stoltzfus
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CdS has a band gap of 2.4 eV. If large crystals of CdS are

Chapter , Problem 12.92

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QUESTION:

CdS has a band gap of 2.4 eV. If large crystals of CdS are illuminated with ultraviolet light, they emit light equal to the band gap energy. (a) What color is the emitted light? (b) Would appropriately sized CdS quantum dots be able to emit blue light? (c) What about red light?

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QUESTION:

CdS has a band gap of 2.4 eV. If large crystals of CdS are illuminated with ultraviolet light, they emit light equal to the band gap energy. (a) What color is the emitted light? (b) Would appropriately sized CdS quantum dots be able to emit blue light? (c) What about red light?

ANSWER:

Problem 12.92 CdS has a band gap of 2.4 eV. If large crystals of CdS are illuminated with ultraviolet light, they emit light equal to the band gap energy. (a) What color is the emitted light (b) Would appropriately sized CdS quantum dots be able to emit blue light (c) What about red light Step-by-step solution Step 1 of 5 (a) Convert the energy in eV to J. The conversion factor is as follows: 1.602×10 19J 1eV 1eV (or) 1.602×10 19J 1.602×10 19J2.4eV = 2.4eV × 1eV = 3.845 × 10 19J

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