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固体粉末荧光
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The fluorescence and reflection spectra of ASm2I5 (,4=:K,Rb,Cs,Tl) in solid state were studied systematically. The splitting energy(AAAAAAAA) and f-d excited energy (Efd)of Sm2+ in cubic crystal lattice field are discussed. It is indicated that the increase in r(A+) leads to the decrease in the crystal lattice field effect, and the covalence effect is decreased because of the increase of electronegativity difference between A+ and I-. As a consequence the Efd is reduced. The fact that the fluorescence spectra...

The fluorescence and reflection spectra of ASm2I5 (,4=:K,Rb,Cs,Tl) in solid state were studied systematically. The splitting energy(AAAAAAAA) and f-d excited energy (Efd)of Sm2+ in cubic crystal lattice field are discussed. It is indicated that the increase in r(A+) leads to the decrease in the crystal lattice field effect, and the covalence effect is decreased because of the increase of electronegativity difference between A+ and I-. As a consequence the Efd is reduced. The fact that the fluorescence spectra shift to red or blue among ASm2I5 can be explained by these effects.

本文系统地研究了化合物ASm_2I_5(A=K,Rb,Cs,T1)固体粉末的荧光光谱和反射光谱.讨论了Sm~(2+)在立方晶体场中的分裂能随着碱金属离子半径的增大而减小和f-d激发能随着A-I(A=Rb,T1)键的共价性增加而明显降低的现象.并从晶场效应和化学键性质两个方面解释了ASm_2I_5(A=K,Rb,Cs)和ASm_2I_5(A=Rb,T1)中的Sm~(2+)荧光光谱分别发生蓝移和红移的现象.

The title chelates were prepared by benzoyltrifluoroacetone with TPPO,Bipy,Phen,N(Me)4OH and Eu,Tb,Sm,Dy chlorides.They are tri--β-diketonates and tetra-β-diketonates.The fluorescence spectra of solid paosphor were determined at room temperature.The transferable intensity of energy of europium chelates in 5D0-7F2 is the strongest. The relative intensities of luminescence for EuL3Bipy and EuL3(TPPO)2 are very strong. They are 100% and 93.7% respectively. The transition is 5D4-7F5 for Tb, 4C5/ 2?H9/2 for Sm and...

The title chelates were prepared by benzoyltrifluoroacetone with TPPO,Bipy,Phen,N(Me)4OH and Eu,Tb,Sm,Dy chlorides.They are tri--β-diketonates and tetra-β-diketonates.The fluorescence spectra of solid paosphor were determined at room temperature.The transferable intensity of energy of europium chelates in 5D0-7F2 is the strongest. The relative intensities of luminescence for EuL3Bipy and EuL3(TPPO)2 are very strong. They are 100% and 93.7% respectively. The transition is 5D4-7F5 for Tb, 4C5/ 2?H9/2 for Sm and 4F9/2-6H12/2 for Dy. The intensities of luminescence for the chelates of Tb,Sm and Dy are very weak,except TbL3(TPPO)2.Due to its higher stability,the fluorescence intensity of N(Me)4E(?)L4 in nonpolar solvent is the strongest.It is found that a minute amount of E(?)L3 Bipy or EuL3(TPPO)2 in transparent resin will show sharp red fluorescence under the irradiation of-365nm light.

本文合成了苯甲酰三氟乙酰丙酮(简称L)和三苯基氧化膦(TPPO)、联吡啶(Bipy)、邻菲罗林(Phen)。四甲基氢氧化铵(NMe_4OH)与Eu、Tb、Sm、Dy的三合型和四合型共十六种配合物,常温下研究了它们的固体粉末荧光光谱,发现四种铕配合物中Eu~(3+)的~5D_0—~7F_2跃迁最强,而且EuL_3Bipy和EuL_3(TPPO)_2发光相对强度特别高,其余三种离子的特征跃迁能级:Tb~(3+)是~3D_4—~7F_5,Sm~(3+)是~4G_(5/2)—~6H_(3/2),Dy~(3+)是~4F_(9/2)—~6H_(1/2),除TbL_3(TPPO)_2外,其余发光强度不大.发现四合型NMe_4EuL_4在非极性溶剂中荧光强度最大,表明其稳定性高.在PS树脂中添加微量EuL_3Bipy或EuL_3(TPPO)_2,在~365nm光照射下显示鲜艳的红色荧光.

Terbium perchlorate with diphenyl sulfoxide(DPSO) and phenyl-butyl sulfoxide(PBSO) coordination compounds bud Terbium hexafluorophosphate with diphenyl sulfoxide coordination compound have been synthesized. The resultes of composition analysis confirmed to the formula:Tb (DPSO)6. (CIO4)3, [Tb (DPSO)7] (PF6)3, Tb (PBSO)6·(CIO4)3. In the fluorescent experiments it was found that fluorescence emission intensity for Tb3+ ion in terbium perchlorate with diphenyl sulfoxide coordination compounds is highest. Because...

Terbium perchlorate with diphenyl sulfoxide(DPSO) and phenyl-butyl sulfoxide(PBSO) coordination compounds bud Terbium hexafluorophosphate with diphenyl sulfoxide coordination compound have been synthesized. The resultes of composition analysis confirmed to the formula:Tb (DPSO)6. (CIO4)3, [Tb (DPSO)7] (PF6)3, Tb (PBSO)6·(CIO4)3. In the fluorescent experiments it was found that fluorescence emission intensity for Tb3+ ion in terbium perchlorate with diphenyl sulfoxide coordination compounds is highest. Because the excitation energy of DPSO ligand is very easily transferred to Tb3+ ion in Tb(DPSO)6·(CIO4)3 coordination compound.

合成了Tb(DPSO)6·(ClO4)3、Tb(DPSO)7·(PF6)3及Tb(PBSO)6·(ClO4)3配合物(DPSO为二苯基亚砜PBSO为苯丁基亚砜).在室温下测定了它们的固体粉末荧光激发和发射光谱,结果表明Tb(DPSO)6·(ClO4)3配合物中Tb3+的发光强度最高,其中5D4→7F5跃迁谱带强度高达806.2cd,Tb(DPSO)7(PF6)3配合物中Tb3+发光强度次之,Tb(PBSO)6(ClO4)3配合物中Tb3+的发光强度最弱.这说明二苯亚砜做为配体受激后向Tb3+离子传递能量的效率高于苯丁基亚砜,另外ClO4-做为阴离子也可增加Tb3+的发光强度,原因是部分外界ClO4-离子可进入内界参予配位,降低了配合物的对称性,部分解除了跃迁禁律,提高了Tb3+的发光强度.

 
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