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Experimental and theoretical investigation of tris-(8-hydroxy-quinolinate) aluminum (Alq3) photo degradation |
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| Authors: | Flávia P Rosselli Welber G Quirino Cristiano Legnani Vanessa L Calil Kelly C Teixeira Alexandre A Leitão Rodrigo B Capaz Marco Cremona Carlos A Achete |
| Affiliation: | 1. Divisão de Metrologia de Materiais (DIMAT), Inmetro, Av. Nossa Senhora das Graças, 50, Xerém, Duque de Caxias, RJ CEP 25250-020, Brazil;2. Laboratório de Optoeletrônica Molecular, LOEM, Departamento de Física, PUC-Rio, C.P. 38071, RJ 22453-970, Rio de Janeiro, Brazil;3. Departamento de Química, Universidade Federal de Juiz de Fora, Juiz de Fora, MG, CEP 36036-330, Brazil;4. Instituto de Física, Universidade Federal do Rio de Janeiro, Caixa Postal 68528, Rio de Janeiro, RJ 21941-972, Brazil;5. Programa de Engenharia Metalúrgica e de Materiais, COPPE, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ 21941-972, Brazil |
| Abstract: | We investigate the stability of tris-(8-hydroxyquinolinato) aluminum (Alq3) under UV photo degradation using a combination of experimental and theoretical techniques. Alq3 thin films were irradiated with He–Xe lamp discharges, as a function of the exposition time, at a wavelength λ = 307 nm. The irradiated and non-irradiated films were analyzed by Fourier transform infrared (FTIR) spectroscopy. The experimental FTIR spectrum of the exposed sample exhibits a band at 1697 cm?1, attributed to a carbonyl group. Theoretical calculations of Gibbs free energy and molecular vibrational properties for a variety of possible degradation products allow us to determine the most likely products and produce insight into the degradation mechanisms. |
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