Two-photon ionization and recombination processes of an aromatic chromophore doped in polymer films werestudied and the features of these processes were discussed in relation to photofunctional polymers

An aromatic moleculehaving low ionization potential

e.g.

N

N

N'

N'-tetramethyl-p-phenylene diamine doped in poly(methyl methacrylate)(PMMA) film was easily photoionized by intense laser ligh excitation

giving a colored radical cation (photochromism) anda trapped electron in PMMA matrix. As a reversed process

the radical cation recombined with the trapped electron

showing discoloration and emitting luminescence

either isothermal luminescence(ITL)

or thermoluminescence(TL).In this report

ITL and TL through the charge recombination process were studied and the luminescence was suggested as a mean of the read-out of photorecording.