Abstract
Abstract In this paper, we explore codoping with monovalent ions: Li+, Na+, and K+, as a method of altering the scintillation properties of praseodymium-doped (Lu0.75Y0.25)3Al5O12 (LuYAG: Pr3+) single crystals. Substantial effort was given to optimizing the growth process to mitigate cracking which occurred in the LuYAG crystals beginning around the shoulder region and continuing throughout the boule. Growth parameters such as the translation and rotation rate, cool down duration, and boule geometry were altered to successfully address this challenge. Scintillation light yield, energy resolution, and scintillation decay time were measured for each of these crystals. It was discovered that monovalent codoping significantly improved scintillation light yield by at least 50%; accelerated and increased the weight of the fast component of scintillation decay; and enhanced energy resolution to values of as low as 3.8%, the best energy resolution reported for an oxide scintillator to date. The enhancements in scintillation performance are related to the effect of monovalent codoping on the formation of defects, in particular oxygen vacancies, within the LuYAG matrix and is proven via thermoluminescence and afterglow measurements.
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