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Triplet to triplet absorption in organic molecules for use in photochromic devices

Auteur : John L Kropp; Maurice W Windsor; Air Force Materials Laboratory (U.S.); TRW Systems Group.
Éditeur : Wright-Patterson Air Force Base, Ohio : Air Force Materials Laboratory, Air Force Systems Command, United States Air Force, 1968.
Collection : Air Force Materials Laboratory (U.S.).; Technical Report
Édition/format :   Livre imprimé : National government publication : English
Base de données :WorldCat
Résumé :
The photochromic properties of several substituted aromatics and heterocyclics have been investigated. The absorption spectra, phosphorescence lifetime T-T absorption spectra and the product of triplet extinction coefficient and triplet formation efficiency, were evaluated for representative compounds. Using these data the photochromic properties of heterocyclics are compared to their hydrocarbon analogs. The values  Lire la suite...
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Type d’ouvrage : Government publication, National government publication
Format : Book
Tous les auteurs / collaborateurs : John L Kropp; Maurice W Windsor; Air Force Materials Laboratory (U.S.); TRW Systems Group.
Numéro OCLC : 428078065
Notes : "August 1968."
AD0675323 (from http://www.dtic.mil).
Research supported by the United States Air Force Materials Laboratory, and performed by TRW Systems Group.
Description : vi, 60 pages : illustrations, tables ; 28 cm.
Titre de collection : Air Force Materials Laboratory (U.S.).; Technical Report
Responsabilité : J.L. Kropp, M.W. Windsor.

Résumé :

The photochromic properties of several substituted aromatics and heterocyclics have been investigated. The absorption spectra, phosphorescence lifetime T-T absorption spectra and the product of triplet extinction coefficient and triplet formation efficiency, were evaluated for representative compounds. Using these data the photochromic properties of heterocyclics are compared to their hydrocarbon analogs. The values of the maximum triplet formation efficiency are lower for heterocyclics than for aromatics. However, broader T-T absorption and more efficient absorption for pumping light suggest that, on balance, heterocyclics are comparable to aromatic hydrocarbons in their effectiveness as photochromic materials. The variation of solvent induces large changes in the photochromic properties of heterocyclics thus providing a useful additional parameter for adjusting their properties. These differences also promise to shed light on the mechanism of radiationless transitions in these compounds. Recommendations for further studies to improve the photochromic properties of heterocyclics are made.

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