Triplet emission from poly(3,6-dibromo-N-vinylcarbazole): Spectra and kinetics

Journal Article · Sun Jan 01 04:00:00 EST 1989 · Macromolecules; (United States)

DOI:https://doi.org/10.1021/ma00192a045· OSTI ID:7273636

Starzyk, F; Burkhart, R D ^[1]

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1. Univ. of Nevada, Reno (United States)

The triplet delayed emission of poly(3,6-dibromo-N-vinylcarbazole) (PdBVK) in a 2-methyltetrahydrofuran (MTHF) frozen solution at 77K was examined within the spectral and time regimes of 400-570 nm and 0.2-50 ms, respectively. The influence on optical absorption of bromine substitution into the carbazole ring (3- and 6-positions) of poly(N-vinylcarbazole), as well as delayed triplet emission spectra and the kinetic decays, was monitored. The phosphorescence spectra were recorded at different delay times after excitation. The phosphorescence decays were found to be essentially exponential in the wings of the phosphorescence band but showed unusual, definitely nonexponential, behavior in the range 460-475 nm, which is the range of maximum phosphorescence intensity. A resolution of the phosphorescence band into Gaussian components yielded excellent fits by using three components at delay times less than 2 ms and two components for spectra taken at longer delay times. Based upon an average of 12 different spectra recorded at various times after excitation, the calculated wavelengths at maximum intensity for these Gaussian components were found to be 448{plus minus}2 nm, 473{plus minus}4 nm, and 501{plus minus}8 nm.

• DOE Contract Number: FG08-84ER45107
• OSTI ID: 7273636
• Journal Information: Macromolecules; (United States), Journal Name: Macromolecules; (United States) Vol. 22:2; ISSN MAMOB; ISSN 0024-9297
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
AROMATICS
AZAARENES
AZOLES
CARBAZOLES
DATA
DATA ANALYSIS
ELECTROMAGNETIC RADIATION
EMISSION SPECTROSCOPY
ENERGY LEVELS
EXPERIMENTAL DATA
HETEROCYCLIC COMPOUNDS
INFORMATION
KINETICS
LUMINESCENCE
NUMERICAL DATA
ORGANIC BROMINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PHOSPHORESCENCE
RADIATIONS
RESOLUTION
SPECTROSCOPY
TIME RESOLUTION
TIMING PROPERTIES
VISIBLE RADIATION