PPT Slide
Characteristics of Efficient TFEL Phosphors
- Bandgap in the range of 3.0 - 4.5 eV
- Threshold voltage for charge injection 1.3 - 2.0 MV/cm
- Relatively low energy optical phonons (hu° = 44 meV)
- Onset of inter-valley scattering > 1 eV
- Low density of states in conduction band > 3 eV
- Excited state stable in the electric field ( V/m)
- Ionic radius comparable to cation of the matrix
- Isoelectronic dopant (or need for charge compensation)
- Low concentration quenching and low thermal quenching