Polymer Optics

What we learned

1. Photon vs electron
2. UV, X-rays, Gamma rays, IR, Microwaves
3. Radiometry

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+ Energy

If Ek=2.5 MeV (1eV=1.6*10^-19J),

Photon VS electron

1. Relativistic momentum
2. de Brogile wavelength
3. speed

Electron: E=mc²+Ek=0.511MeV+2.5MeV=3.011MeV=4.82*10^-13J

(mc²=9.11*10^-31kg*(3*10⁸m/s)²=8.19*10^-14J=0.511MeV

E=4.82*10^-13J

P=1.58*10^-21kg m/s(electron), 1.61*10^-21kg m/s(photon)

λ=0.419pm(electron), 0.412pm(photon)

v=2.95*10⁸m/s(electron), 3*10⁸m/s(photon)

포항가속기연구소

10GeV: 2.999999996*10⁸m/s

ZnS, Phosphors, Calcium tungstate

electron

Phosphors

photon

bandgap

Bohr’s experiment

bandgap

bandgap

LED

LED vs OLED (organic light emitting diode)

Lowest unoccupied

molecular orbital

Highly occupied

molecular orbital

Conjugate

Organic -> Flexible

Solar cell

Electron -> photon : screen

Photon -> electron : solarcell

Dye-sensitized solar cell

Radar sensor

f: 100MHz

Photosensitivity: 6.63*10^-16J/s

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λ=c/ν=3m

Photon E=hν=6.63*10^-26J=4.14*10^-7eV

6.63*10^-16J/s / 6.63*10^-26J = 10¹⁰ /s, the detector can detect 10¹⁰ photons per second

Energy of photon

Eye sensitivity

λ : 555nm

Photosensitivity: 6.63*10^-16J/s

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Photon E=hν=hc/ λ =3.58*10^-19J=2.2eV

6.63*10^-16J/s / 3.58*10^-19J = 1850 /s

X-ray

λ : 0.1nm

Photosensitivity: 6.63*10^-16J/s

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Photon E=hν=hc/ λ =1.99*10^-15J=12,400eV

6.63*10^-16J/s / 1.99*10^-15J = 0.33 /s

Energy of solar radiation

Solar irradiance (W/m²) = ∫spectral irradiance dλ

AM: air mass

AM0

AM1

AM1.5 G173

AM(1/cosθ)

Σ(solar irradiance)dλ