Quantum Dot
Energy levels, optical absorption and quantum confinement in nanostructures
Parameters
Energy Levels
Quantum Dot — Quiz
Q1. CdSe QD radius decreases from 3 nm to 1.5 nm. Emission wavelength:
A
Increases (red shift)
B
Decreases (blue shift)
C
Does not change
D
Goes to zero
Q2. In the Brus equation, the Coulomb term:
A
Is positive and scales as ~1/R²
B
Is negative and scales as ~1/R
C
Is negative and scales as ~1/R²
D
Is positive and scales as ~1/R
Q3. In CdSe/ZnS core-shell, the role of ZnS shell is:
A
Increasing the bandgap
B
Reducing surface defects, increasing quantum yield
C
Shifting wavelength to IR
D
Reducing effective mass
Q4. In the "particle in a sphere" model, energy levels are determined by:
A
Zeros of Hermite polynomials
B
Zeros of Legendre polynomials
C
Fourier series coefficients
D
Zeros of spherical Bessel functions