What are radiative transitions?
A radiative transition is one in which the energy is released as a photon. The nature of the emission depends on the nature of the initial and final states and the route to the excited state. The overlap between the lowest energy absorption and the high-energy emission is characteristic of this type of system.
What is radiative recombination mechanism in semiconductors?
Radiative recombination occurs when an electron in the conduction band recombines with a hole in the valence band and the excess energy is emitted in the form of a photon. Radiative recombination is thus the radiative transition of an electron in the conduction band to an empty state (hole) in the valence band.
What is radiative transition in quantum mechanics?
[′rād·ē‚ād·iv tran′zish·ən] (quantum mechanics) A change of a quantum-mechanical system from one energy state to another in which electromagnetic radiation is emitted.
What is radiative and non-radiative recombination in semiconductors?
Non-radiative recombination is a process in phosphors and semiconductors, whereby charge carriers recombine releasing phonons instead of photons. Non-radiative recombination in optoelectronics and phosphors is an unwanted process, lowering the light generation efficiency and increasing heat losses.
What are radiative and nonradiative transitions?
Radiative transitions involve the absorption of a photon, if the transition occurs to a higher energy level, or the emission of a photon, for a transition to a lower level. Nonradiative transitions arise through several different mechanisms, all differently labeled in the diagram.
What is radiative and nonradiative process?
A radiative transition from a lower to a higher electronic state of a molecule. The energy of the photon is converted to the internal energy of the molecule. A non-radiative transition to a lower vibrational level within the same electronic state.
Which of the following are radiative semiconductor?
These are semiconductor materials, of which silicon and germanium are the predominant examples. In these materials, charges created by radiation can be collected efficiently over distances of many centimetres.
What is radiative and nonradiative transition?
What are the requirements to obtain phosphorescence?
– phosphorescence requires intersystem crossing.
What are radiative and non radiative transitions explain?
Radiative transitions involve the absorption, if the transition occurs to a higher energy level, or the emission, in the reverse case, of a photon. Nonradiative transitions arise through several different mechanisms, all differently labeled in the diagram.
Which of the following is radiative semiconductor?
These are semiconductor materials, of which silicon and germanium are the predominant examples. In these materials, charges created by radiation can be collected efficiently over distances of many centimetres. In silicon the band gap is about 1.1 eV, and in germanium it is about 0.7 eV.
Which radiative transition is fluorescence?
A radiative transition between two electronic states of the same spin multiplicity. The emission of photons from the S1 → S0 radiative transition is known as fluorescence which occurs on a timescale of 10-10 to 10-7 s and is shown by the green arrows in Figure 2.