Markus P. Hehlen

Power dependence of upconversion luminescence in lanthanide and transition-metal-ion systems

Markus Pollnau, Daniel R. Gamelin, Stefan R. Lüthi et al. · Physical review. B, Condensed matter · 2000 · 2.2K citations

Natural Sciences, Materials Science, Physics +16

Hexagonal Sodium Yttrium Fluoride Based Green and Blue Emitting Upconversion Phosphors

Karl W. Krämer, Daniel Biner, G. Frei et al. · Chemistry of Materials · 2004 · 1.2K citations

Natural Sciences, Materials Engineering, Materials Science +17

50th anniversary of the Judd–Ofelt theory: An experimentalist's view of the formalism and its application

Markus P. Hehlen, M.G. Brik, Karl W. Krämer · Journal of Luminescence · 2012 · 438 citations

Humanities, Philosophy, Physics +3

Solid-state optical refrigeration to sub-100 Kelvin regime

Seth D. Melgaard, Alexander R. Albrecht, Markus P. Hehlen et al. · Scientific Reports · 2016 · 185 citations · Full text

Natural Sciences, Materials Engineering, Materials Science +15

Cooperative Bistability in Dense, Excited Atomic Systems

Markus P. Hehlen, H. U. Güdel, Q. Z. Shu et al. · Physical Review Letters · 1994 · 162 citations

Natural Sciences, Physics, Atomic Physics +15