Volume 107, Issue 1, 01 January 2010
Index of content:
107(2010); http://dx.doi.org/10.1063/1.3275871View Description Hide Description
The luminescent lifetime of and has been determined as a function of temperature. We have shown that the luminescence of both materials can be used to determine the temperature of a surface up to . The results are qualitatively explained via multiphonon emission. Phonon energies and the number of phonons needed to cross the energy gap are estimated. The results are useful in the design of phosphors for noncontact thermometry in high-temperature applications.
107(2010); http://dx.doi.org/10.1063/1.3275872View Description Hide Description
The strain relaxation in low mismatched layers has been studied by triple axis x-ray diffraction, transmission electron microscopy, and photoluminescence. Using a two step buffer, a fully relaxed top layer has been grown by adapting the composition and thickness of a first “strained layer.” The threading dislocation density in the top layer is below and strain is relaxed at the substrate/first layer interface by misfit dislocations. This scheme is a promising method to limit the thickness of buffer layers and obtain fully relaxed pseudosubstrates.