Photochemical and nonphotochemical hole burning in dimethyl-s-tetrazine in a polyvinyl carbazole film

Journal Article · Thu Jan 01 04:00:00 EST 1981 · Chemical Physics

DOI:https://doi.org/10.1016/0301-0104(81)80236-4· OSTI ID:1070018

Cuellar, E. ^[1]; Castro, G. ^[2]

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1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Energy and Environment Division
2. IBM Research Lab., San Jose, CA (United States)

Hole burning as well as fluorescence line narrowing experiments have been performed on the system dimethyl-s-tetrazine in polyvinyl carbazole films at low temperatures. The first singlet electronic absorption bands are typical (300 cm^-1 wide) of inhomogeneously broadened bands of guest molecules in amorphous organic hosts. In this paper, evidence is presented for both photochemical and nonphotochemical hole burning. The narrowest holes observed were lorentzian, had a width of 0.44 cm^-1 at 1.8 K, and are believed to be of nonphotochemical origin. A model which envisions the guest molecules to occupy different sites in the polymer host with a distribution of energy barriers between sites is used to describe these observations. Finally, the fast (20 ps) relaxation time implied by the 0.44 cm^-1 lorentzian linewidth is interpreted as indicative of the rate of site interconversion in the excited state.

• Research Organization: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); International Business Machines (IBM) Corporation (United States)
• Contributing Organization: IBM Research Lab., San Jose, CA (United States)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 1070018
• Report Number(s): LBL--10942
• Journal Information: Chemical Physics, Journal Name: Chemical Physics Journal Issue: 2 Vol. 54; ISSN 0301-0104
• Publisher: Elsevier
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY