Soft x-ray-excited luminescence and optical x-ray absorption fine structures of tris (8-hydroxyquinoline) aluminum

Naftel, S. J.; Zhang, P.; Kim, P.-S.; Sham, T. K.; Coulthard, I.; Antel, W. J.; Freeland, J. W.; Frigo, S. P.; Fung, M.-K.; Lee, S. T.; Hu, Y. F.; Yates, B. W.
March 2001
Applied Physics Letters;3/26/2001, Vol. 78 Issue 13, p1847
Academic Journal
Photoluminescence from tris (8-hydroxyquinoline) aluminum (Alq[sub 3]) films has been observed using tunable soft x rays as an excitation source. The photons were tuned to energies above and below the K absorption edges of C, N, O, and Al. The luminescence was in turn used to monitor the absorption. It was found that the luminescence induced by soft x ray exhibits additional emission bands at shorter wavelengths compared to ultraviolet excitation. While all K edges exhibit optical x-ray absorption fine structures (XAFS) similar to those of total electron and fluorescence yield, the optical XAFS at the C K-edge resonance are enhanced for the C1s to π[sup *] transitions, indicating site specificity. These observations are attributed to the energetics of the process and the local electronic structure. © 2001 American Institute of Physics.


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