
Photonics NCs
Quiz
•
Physics
•
University
•
Easy
Mentorstvo ITMO
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15 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A colloidal synthesis of nanocrystals doesn't allow to
NPs with approximately the same size or narrow distribution of sizes
NPs with the same shape and topology of their surface
NPs with the same chemical composition and lattice structure
Obtaine a thin NC film on substrates
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
The efficient band gap energy of NCs ... due to the size of a quantum dot decreases
Increases
Decreases
Does not change
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Quantum dots of the first type are QDs characterized with
A large-gap semiconductor is grown onto a narrow-gap semiconductor core (оболочка из полупроводника с большой шириной запрещенной зоны наращивается на ядро из полупроводника с меньшей шириной запрещенной зоны)
A narrow-gap semiconductor is grown onto a large-gap semiconductor core (оболочка из полупроводника с меньшей шириной запрещенной зоны наращивается на ядро из полупроводника с большей шириной запрещенной зоны)
The energy levels of an electron and a hole in the shell are located lower than in the nucleus; in this case, the band gap of the shell is approximately the same as that of the core (энергетические уровни электрона и дырки в оболочке располагаются ниже, чем в ядре; при этом ширина запрещенной зоны оболочки примерно такая же, как у ядра)
The energy levels of an electron and a hole in the shell are located higher than in the nucleus; in this case, the band gap of the shell is approximately the same as that of the core (энергетические уровни электрона и дырки в оболочке располагаются выше, чем в ядре; при этом ширина запрещенной зоны оболочки примерно такая же, как у ядра)
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Which process has the highest rate?
Phosphorescence
Fluorescence
Intercombination conversion
Vibrational relaxation
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Photon radiation occurs only from the lowest excited state S1 or T1.
Levshin's rule
Stokes-Lommel rule
Kasha's rule
Vavilov's law
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
The emission spectrum of molecule doesn’t depend on the exciting light frequency.
Levshin's rule
Stokes-Lommel rule
Kasha's rule
Vavilov's law
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What type of delayed fluorescence does not exist?
E-type
N-type
P-type
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