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Quiz-I
1、【判断题】Organic molecule can contain metal atom.
A、正确
B、错误
2、【判断题】There are some differences in opto-electronics processes between organic and inorganic materials.
A、正确
B、错误
3、【判断题】There is only one kind of exciton.
A、正确
B、错误
4、【判断题】All organic materials have small conductivity, i.e., they are insulators.
A、正确
B、错误
5、【判断题】Conventional electronics is based on inorganic semiconductors.
A、正确
B、错误
6、【判断题】In organic materials there are no covalent bondings.
A、正确
B、错误
7、【判断题】Compared to covalent bonding forces in inorganic semiconductors, the van de Waals forces in organic materials are nearly ten times smaller.
A、正确
B、错误
8、【判断题】Conjugation is an essential structure in photoelectronically active organic materials.
A、正确
B、错误
9、【判断题】Excitons in organic materials are Wannier type with long radius.
A、正确
B、错误
10、【判断题】The transport mode of carrier in organic materials is mainly hopping with low mobility.
A、正确
B、错误
Quiz-II
1、【判断题】Conjugation size of organic molecular partially determined the carrier transportation property.
A、正确
B、错误
2、【判断题】Covalent bonding can also exist in inorganic materials.
A、正确
B、错误
3、【判断题】σ electron can easily delocalize.
A、正确
B、错误
4、【判断题】An ionic crystal consists of cations and anions, therefore, the ionic crystal can conduct electricity.
A、正确
B、错误
5、【判断题】If there is only one covalent bond between two atoms, it is σ bond.
A、正确
B、错误
6、【判断题】Hydrogen bonding belongs to permanent dipole-dipole interaction, it is one of the van der Waals interaction
A、正确
B、错误
7、【判断题】Stable molecular stacking requires minimized lattice energy
A、正确
B、错误
8、【判断题】Compared to Debye force, London force is more polarisability-dependent
A、正确
B、错误
9、【判断题】Atomic orbital describes orbital energy only.
A、正确
B、错误
10、【判断题】Generally, π electron shows higher energy than that of σ electron, so π* electron also shows higher energy than that of σ* electron.
A、正确
B、错误
Q3
1、【判断题】HOMO and LUMO concept can be used for all isolated organic or inorganic molecules.
A、正确
B、错误
2、【判断题】Ionization potential determines the ability of hole injection to a molecule.
A、正确
B、错误
3、【判断题】Electron affinity is the ability of molecule to attract electron.
A、正确
B、错误
4、【判断题】Metal work function is different with Fermi level in number.
A、正确
B、错误
5、【判断题】Conduction band is fully filled with electrons.
A、正确
B、错误
Quiz-IV
1、【判断题】Hydrogen bonding belongs to permanent dipole-dipole interaction, it is one of the van der Waals interaction.
A、正确
B、错误
2、【判断题】Stable molecular stacking requires minimized lattice energy.
A、正确
B、错误
3、【判断题】Compared to Debye force, London force is more polarisability-dependent.
A、正确
B、错误
4、【判断题】Organic solids are all in amorphous state.
A、正确
B、错误
5、【判断题】All organic molecules have permanent dipole.
A、正确
B、错误
Quiz-V
1、【判断题】In triplet state, the spin directions of the two unpaired electrons are opposite
A、正确
B、错误
2、【判断题】In the ground state of organic molecules, electrons are generally paired, and the total spin number is zero
A、正确
B、错误
3、【判断题】Non-radiative decay processes refer to the electron transition from higher energy level to lower energy level without light emission
A、正确
B、错误
4、【判断题】In an excited organic molecule, the nonradiative decay processes always exist
A、正确
B、错误
5、【判断题】An internal conversion process can not occur between two different electronic levels
A、正确
B、错误
6、【判断题】The rate of internal conversion is faster than the radiative decay process
A、正确
B、错误
7、【判断题】Internal conversion can occur within the same electronic level, as well as different electronic levels
A、正确
B、错误
8、【判断题】Generally, inter system crossing (ISC) is forbidden, spin-orbital coupling can release the forbidden feature
A、正确
B、错误
9、【判断题】Spin-orbital coupling renders triplet state lost its feature and exhibiting some singlet characteristic, which can promote inter system crossing (ISC) and phosphorescent emission
A、正确
B、错误
10、【判断题】Compared to pure organic materials, metal complexes generally exhibit more strong spin-orbital coupling, as well as more strong phosphorescence
A、正确
B、错误
Quiz-VI
1、【判断题】The Franck-Condon factor is related to the equilibrium position of the two vibrational stats. The larger the value, the more the overlap, and the stronger the transition.
A、正确
B、错误
2、【判断题】Franck-Condon shift is a Stokes shift caused by molecular conformation shift
A、正确
B、错误
3、【判断题】According to Franck-Condon principle, and if the environmental influence to the two states is small, the absorption and the emission spectra will be mirror symmetry
A、正确
B、错误
4、【判断题】In spectra of optical absorption or emission, the rotational energy some time is observable as fine structure
A、正确
B、错误
5、【判断题】Dipole allowed optical transition occurs between two electronic state with same symmetry
A、正确
B、错误
Quiz-VII
1、【判断题】Compared to monomer emission, the excimer emission is redshift, structureless, but short lifetime.
A、正确
B、错误
2、【判断题】There is no ground state for excimer, but exists ground state for exciplex.
A、正确
B、错误
3、【判断题】Electric field generally assists the dissociation of exciplex.
A、正确
B、错误
4、【判断题】Excimer is formed by two different molecules
A、正确
B、错误
5、【判断题】Dimer is formed by two same molecules
A、正确
B、错误
6、【判断题】Compared to photoluminescence from dilute solution of a pure organic material, the photoluminescence from the solid state of this pure material decreases dramatically with very large redshift. This is due to exciplex formation.
A、正确
B、错误
Quiz-VIII
1、【判断题】Under optical excitation only singlet exciton exists.
A、正确
B、错误
2、【判断题】Dexter energy transfer is a resonance energy transfer by dipole interaction between the donor molecule and the acceptor molecule.
A、正确
B、错误
3、【判断题】Frenkel exciton has the smallest radius.
A、正确
B、错误
4、【判断题】Wannier exciton is generally found in inorganic semiconductors.
A、正确
B、错误
Quiz-IX
1、【判断题】When we say that anthracene is a photoconductor, it means that the conductivity of this material is higher at irradiation with energy larger than its bandgap, compared to dark current.
A、正确
B、错误
2、【判断题】To evaluate the conductivity of a material, the only micro factor is carrier mobility.
A、正确
B、错误
3、【判断题】Both producing external photoelectric effect and photoluminescence need light irradiation. And the light energy is much higher in the latter case.
A、正确
B、错误
4、【判断题】Organic material system can be conductor, semiconductor, insulator, even superconductor.
A、正确
B、错误
5、【判断题】Generally speaking in an organic material, the average energy of a hole is approximately equal to the energy of HOMO electron
A、正确
B、错误
6、【判断题】When dopant with valence electrons less than those in the host semiconductor is introduced, the resulting doped system is n-type semiconductor.
A、正确
B、错误
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