The energy of the emitted light decreases with increasing particle size. Explain this effect?
The colour of the fluorescence of colloidal solutions of CdS nanoparticles depends on their size, changing from blue for small particles (1.7 nm), through green and yellow to orange red for 6 nm particles. This means that the energy of the emitted light decreases with increasing particle size. Explain this effect.
Does anyone know what theory, if any, this corresponds to? Thanks.
particles don't change size size of a particle is constant due to electron repulsion and pull of the nucleus
the particles remain at the same size its the wavelength that change
if you note a long wavelength has a low frequency and a short wavelength has a high frequency and use the equation E=hf
E=energy
h= planks constant (not important here)
f = frequency
you'll see that the shorter the wavelength the higher the frequency the more energy it has
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