The effect of fluorination on spectroscopic properties of europium and terbium trifluoroacetylacetonates Ln(TFAA)₃·2H₂O, Ln(TFAA)₃·Phen and Ln(TFAA)₃·Bpy in the solid state have been investigated. A threefold increase in the luminescence intensity of europium compounds at -CF₃ for −CH₃ substitution in the β-diketonate ligand was obtained at 77 and 295 K. Different mechanisms of the excitation energy transfer to Ln³⁺ ions in europium and terbium compounds, which result in a drop in the luminescence efficiency at elevated temperatures, have been analyzed. A key role of ligand-metal charge transfer (LMCT) states in the processes of sensitization of the europium trifluoroacetylacetonates is demonstrated. Expansion of the energy gap between the LMCT state and the lowest triplet state T₁ at fluorination gives rise to an increase in the excitation efficiency of the Eu³⁺ luminescence at 295 K. The back-transfer energy ⁵D₄-T₁ in the terbium trifluoroacetylacetonates is the main reason for shortening the ⁵D₄ lifetime and decreasing the luminescence efficiency. The energy dissipation processes in the lanthanide TFAA adducts with heterocyclic diimines are mainly related to the β-diketonate ligand.

研究了氟化对tri和三氟乙酰丙酮terLn（TFAA）₃ ·2H ₂ O，Ln（TFAA）₃ ·Phen和Ln（TFAA）₃ ·Bpy固态光谱性质的影响。在77和295 K时，β-二酮酸酯配体中-CH ₃取代时-CF ₃处compounds化合物的发光强度增加了三倍。激发能转移到Ln ^3+的机制不同已分析了and和ter化合物中的离子，这些离子会导致高温下的发光效率下降。证明了配体-金属电荷转移（LMCT）状态在三氟乙酰丙酮化ates敏化过程中的关键作用。的LMCT状态和最低三重态T之间的能隙扩大₁在氟化引起的增加Eu的激发效率³⁺在295 K的反向转移能量发光⁵ d ₄ -T ₁在三氟乙酰丙酮化is是缩短⁵ D _4的主要原因寿命和降低发光效率。带有杂环二亚胺的镧系元素TFAA加合物中的能量耗散过程主要与β-二酮酸酯配体有关。