Quantum Dot Lasers and LED

What determines the GaAs-based LED radiation spectra?

• GaAs nanocrystals form (type of Bravais crystal lattice) and its size

• The ratio of chemical elements (gallium and arsenic)

• The presence of other elements in the composition

What determines the Injection lasers conductivity?

• Pressure

• Crystal volume

• Temperature

• Enthalpy

What in the the Fermi-Dirac function k means?

• the probability that an electron will be in a quantum state with energy E

• the Boltzmann constant

• the absolute temperature

• the electrochemical potential or Fermi level

Where si the difference between probabilities of filling the valence band and the conduction band formula?

• Absolute temperature

• Electron energy

• Electrochemical potential or Fermi level

Heterojunction is a contact of two semiconductors of different...

• types of conductivity

• material

• sizes

• semiconductor types

What are the advantage of QDs-based lasers?

• Increase in radiation wavelength shift with increasing current

• Decrease in characteristic temperature T0

• Decrease of gain in an active media

• Low internal losses

Which methods are used for forming the QDs laser active layer?

• Chemical vapour deposition

• Substrate epitaxial growths

• Layer‐by‐Layer Growth

• Stranski–Krastanov growth

What present by itself the III type of QDs LEDS?

• Organic layers of one type

• Organic layers of two types

• Inorganic layers of one type

• Inorganic and organic layers

What types of QDs LEDs were the most popular by 2015?

• Type I

• Type II

• Type III

• Type IV

• OLEDs