Photonics NCs

Photonics NCs

University

15 Qs

quiz-placeholder

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Photonics NCs

Photonics NCs

Assessment

Quiz

Physics

University

Easy

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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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