有机电子学

1Organic molecule can contain metal atom

2There are some differences in opto-electronics processes between organic and inorganic materials

4All organic materials have small conductivity, ie, they are insulators

5Conventional electronics is based on inorganic semiconductors

6In organic materials there are no covalent bondings

7Compared to covalent bonding forces in inorganic semiconductors, the van de Waals forces in organic materials are nearly ten times smaller

8Conjugation is an essential structure in photoelectronically active organic materials

9Excitons in organic materials are Wannier type with long radius

10The transport mode of carrier in organic materials is mainly hopping with low mobility

11Conjugation size of organic molecular partially determined the carrier transportation property

12Covalent bonding can also exist in inorganic materials

13σ electron can easily delocalize

14An ionic crystal consists of cations and anions, therefore, the ionic crystal can conduct electricity

15If there is only one covalent bond between two atoms, it is σ bond

16Hydrogen bonding belongs to permanent dipole-dipole interaction, it is one of the van der Waals interaction

17Stable molecular stacking requires minimized lattice energy

18Compared to Debye force, London force is more polarisability-dependent

19Atomic orbital describes orbital energy only

20Generally, π electron shows higher energy than that of σ electron, so π* electron also shows higher energy than that of σ* electron

21HOMO and LUMO concept can be used for all isolated organic or inorganic molecules

22Ionization potential determines the ability of hole injection to a molecule

23Electron affinity is the ability of molecule to attract electron

24Metal work function is different with Fermi level in number

25Conduction band is fully filled with electrons

26Hydrogen bonding belongs to permanent dipole-dipole interaction, it is one of the van der Waals interaction

27Stable molecular stacking requires minimized lattice energy

28Compared to Debye force, London force is more polarisability-dependent

29Organic solids are all in amorphous state

30All organic molecules have permanent dipole

31In triplet state, the spin directions of the two unpaired electrons are opposite

32In the ground state of organic molecules, electrons are generally paired, and the total spin number is zero

33Non-radiative decay processes refer to the electron transition from higher energy level to lower energy level without light emission

34In an excited organic molecule, the nonradiative decay processes always exist

35An internal conversion process can not occur between two different electronic levels

36The rate of internal conversion is faster than the radiative decay process

37Internal conversion can occur within the same electronic level, as well as different electronic levels

38Generally, inter system crossing (ISC) is forbidden, spin-orbital coupling can release the forbidden feature

39Spin-orbital coupling renders triplet state lost its feature and exhibiting some singlet characteristic, which can promote inter system crossing (ISC) and phosphorescent emission

40Compared to pure organic materials, metal complexes generally exhibit more strong spin-orbital coupling, as well as more strong phosphorescence

41The Franck-Condon factor is related to the equilibrium position of the two vibrational statsThe larger the value, the more the overlap, and the stronger the transition

42Franck-Condon shift is a Stokes shift caused by molecular conformation shift

43According 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

44In spectra of optical absorption or emission, the rotational energy some time is observable as fine structure

45Dipole allowed optical transition occurs between two electronic state with same symmetry

46Compared to monomer emission, the excimer emission is redshift, structureless, but short lifetime

47There is no ground state for excimer, but exists ground state for exciplex

48Electric field generally assists the dissociation of exciplex

49Excimer is formed by two different molecules

50Dimer is formed by two same molecules

51Compared 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 redshiftThis is due to exciplex formation

52Under optical excitation only singlet exciton exists

53Dexter energy transfer is a resonance energy transfer by dipole interaction between the donor molecule and the acceptor molecule

54Frenkel exciton has the smallest radius

55Wannier exciton is generally found in inorganic semiconductors

56When 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

57To evaluate the conductivity of a material, the only micro factor is carrier mobility

58Both producing external photoelectric effect and photoluminescence need light irradiationAnd the light energy is much higher in the latter case

59Organic material system can be conductor, semiconductor, insulator, even superconductor

60Generally speaking in an organic material, the average energy of a hole is approximately equal to the energy of HOMO electron

61When dopant with valence electrons less than those in the host semiconductor is introduced, the resulting doped system is n-type semiconductor