William M. Yen
GRAHAM PERDUE PROFESSOR OF PHYSICS
| Office: | 215 Physics Building |
| Phone: | 706-542-2491 |
| E-mail: | wyen@hal.physast.uga.edu |
| Webpage URL: | http://www.physast.uga.edu/~wyen/ |
| Biographical Information: | Ph.D., Washington (St. Louis), 1962 B.S. (with distinction), University of Redlands, 1956 |
| Honors and Awards: | See curriculum vitae |
Research Interests
Research in our group focuses on the optical properties of solids, particularly those materials which emit light or luminesce. These materials play a central role in a number of important technologies such as optoelectronics and display. We are interested in understanding the dynamical behavior of the optically excited state and in the manner in which the energy in this state is dissipated. Non-radiative processes which affect the excited states include energy transfer and relaxation both of which impact the ultimate efficiency of these materials. We have developed extensive facilities for the synthesis and optical characterization of all of luminescent materials or our interest in single crystal form.
Our research has been supported by agencies such as DARPA, DOE, AFOSR, and NSF.
Recent Publications
D. Jia, W. Jia, X. Wang and W.M. Yen, “Persistent Energy Transfer from Ce3+ to Tb3+ in CaAl2O4,” J. Appl. Phys. 93, 148-152 (2003)
D.J. Lockwood, R.M. White and W.M. Yen, “Origin of Circular Dichroism in Simple Antiferromagnetic Fluorides,” Phys. Rev. B69, 164413 (2004)
Erik van der Kolk, P. Dorenbos, C.W.E. van Eijk, S.A. Basun, G.F. Imbusch and W.M. Yen, “5d Electron Delocalization of Ce3+ and Pr3+ in Y2SiO5 and Lu2SiO5,” Phys. Rev. B71, 165120 (2005)
William M. Yen,” General Factors Governing the Efficiency of Luminescent Devices,” J. Opt. Mat. 27, 1647-52 (2005)
D.B. Gatch, D.M. Boye, Y.R. Shen, M. Grinsberg, W.M. Yen and R.S. Meltzer,” Pressure Dependence of the Impurity Trapped Exciton Emission in BaF2:Eu and BaxSr1-xF2:Eu,” Phys. Rev. B74, 195117 (2006)
W.M. Dennis and W.M. Yen, “Generation, Detection and Spectroscopic Studies of High Frequency Non-equilibrium Phonons in Crystals," J. Lumin. 125, 60-66 (2007)
Optically-detected Magnetic Resonance Investigation of Recombination Processes in Undoped and Rare-earth Doped Mal2O4 (M = Ca, Sr) Persistent Phosphors,” S. Schweitzer, B. Henke, U. Rogulis and W.M. Yen, Appl. Phys. Letters, accepted 1/2007
Books
William M. Yen and Marvin J. Weber, “Inorganic Phosphors: Compositions, Preparation and Optical Properties,” ( CRC Press, Boca Raton, 2004
William M. Yen, Shigeo Shionoya and Hajime Yamamoto, Eds. “Phosphor Handbook,”, Second Edition (CRC Press, Boca Raton, 2006).
William M. Yen et al. , Eds “ Fundamentals of Phosphors,”. (CRC Press, Boca Raton, 2006)
William M. Yen et al. , Eds “Measurements of Phosphor Properties,”. (CRC Press, Boca Raton, 2006)
William M. Yen et al, Eds “Practical Applications of Phosphors“,. (CRC Press, Boca Raton, 2006)
V. Agranovich, F.P. Feofilov, R.S. Meltzer and William M. Yen, Eds., “A Festschrift in Honour of Academician Alexander Kaplyanskii,” J. Lumin. 125 (2007)
