Studies on the temperature dependent phosphorescence of poly(N-vinylcarbazole)

Journal Article · Thu Jul 12 04:00:00 EDT 1979 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100477a022· OSTI ID:5854108

Burkhart, R D; Aviles, R G

Phosphorescence lifetimes and spectra of solid films of poly(N-vinylcarbazole) (PVCA) have been obtained at temperatures between 77 and 298 K. The presence of two trapped triplet species is confirmed and their energies are found to be 1.97 x 10/sup 4/ and 2.12 x 10/sup 4/ cm-/sup 1/. At 77 K the deep trap has a lifetime of 1.7 +- 0.08 s and the shallow trap 7.7 +- 0.6 s. Activation energies for the decay of these two triplets are 1000 cm/sup -1/ for the deep trap and 200 cm/sup -1/ for the shallow trap. Assuming these activation energies represent trap depths below the mobile triplet level, one finds that the energy of mobile triplets is approx. 2.1 x 10/sup 4/ cm/sup -1/ which places it about 2000 cm/sup -1/ below the isolated carbazolyl triplet. Effects of solvent and techniques employed in film formation are found to have minor influences on lifetimes or spectra. 5 figures.

• Research Organization: Univ. of Nevada, Reno
• OSTI ID: 5854108
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 83:14; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360403 -- Materials-- Polymers & Plastics-- Mechanical Properties-- (-1987)
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ACTIVATION ENERGY
AZOLES
CARBAZOLES
ENERGY
HETEROCYCLIC COMPOUNDS
LOW TEMPERATURE
LUMINESCENCE
MEDIUM TEMPERATURE
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC POLYMERS
PHOSPHORESCENCE
POLYMERS
POLYVINYLS
TEMPERATURE DEPENDENCE