The Full Form of LLR is Large Lattice Relaxation.
Large lattice relaxation was first revealed in electron spin resonance studies of vacancies and vacancy-impurity complexes in Si. These centers were found to have large Jahn-Teller distortions. More recent studies, mainly capacitance measurements, have revealed a number of other large lattice relaxation phenomena. These are large Stokes shifts in optical transitions, recombination enhanced defect motion, self-trapping at an impurity and capture by multiphonon emission. All of the processes mentioned above are briefly reviewed, and for capture by multiphonon emission, a detailed model is presented.
LLR
means
Large Lattice Relaxation
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