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KLuS 2 solitary crystal samples undoped and doped using a lower (five %) or higher (38 %) focus of trivalent thulium or ytterbium ions ended up synthesized in the form of skinny hexagonal plates. The low phonon energy (�?20 cm ⁻�?) was confirmed applying Raman spectroscopy. Samples have been researched also by using optical absorption and emi