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Ytterbium ions infrared and visible cooperative luminescences, resulting from YAG laser and selective site excitations, in (6%) Ybdoped Y 2 SiO 5 thin film are analyzed. Magnetically coupled Yb-Yb ion pairs seem to play a major role in energy transfer and cooperative emission, confirming the prevalence of superexchange mechanisms. r

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Yb 3+ crystal field excitations in ytterbium doped Y 2 SiO 5 and Lu 2 SiO 5 single crystals and thin films are studied under an applied magnetic field. The ground and excited state g-factors that are needed for the calculation of reliable crystal field Hamiltonian parameters are determined. Some of the Yb 3+ ions that substitute for the Y 3+ or Lu 3+ ions give rise to Yb 3+ -Yb 3+ magnetically interacting pairs as confirmed by their crystal field absorption bands under a magnetic field. The overall crystal field excitation characteristics confirm the strong similarities between the single crystals studied and thin films.