载体MCM-41对Tb(aspirin)_3phen发光性能的影响  

Effect of Host MCM-41 on the Luminescence Properties of Tb(aspirin)_3phen

作　　者：彭春佳[1] 魏长平[1] 祝翠梅[1] 

机构地区：[1]长春理工大学材料科学与工程学院,吉林长春130022

出　　处：《光谱学与光谱分析》2008年第11期2498-2502,共5页Spectroscopy and Spectral Analysis

基　　金：教育部科学技术研究重点项目(204038);吉林省教育厅科技计划项目(2006237)资助

摘　　要：在室温下,乙二胺环境中合成了高度有序的介孔材料MCM-41,并将经热处理的发光客体Tb(aspi-rin)3phen组装进其孔道,通过激发发射光谱对其光致发光性能进行了研究。结果表明,Tb(aspirin)3phen240～375 nm区间的宽激发峰归属于配体aspirin羰基n→π*跃迁、苯环π→π*跃迁,和phen的杂菲基团吸收,Tb3+的特征发射是由于Antenna效应引起的。相对于纯Tb(aspirin)3phen,Tb(aspirin)3phen-MCM-41B和Tb(aspirin)3phen/MCM-41A的激发谱带出现了明显的分裂,而Tb(aspirin)3phen-MCM-41A只在353nm处剩下了相对较窄的单峰。Tb(aspirin)3phen-MCM-41B,Tb(aspirin)3phen/MCM-41A和Tb(aspirin)3phen-MCM-41A的短波段激发峰依次减弱消失,长波段激发峰逐渐增强,而405 nm发射峰强度IL和544 nm发射峰强度ILn的比值I(I=IL/ILn)依次减小。MCM-41骨架与Tb(aspirin)3phen成键后,不同程度降低了配体aspirin和phen单重态S1和三重态T1能级,且对phen的影响大于aspirin。不同的MCM-41表面晶格场对配体能级的影响顺序为:MCM-41B外表面>MCM-41A外表面>MCM-41A内表面。I值可定性表示MCM-41表面晶格场对配体能级影响程度和MCM-41表面Tb(aspirin)3phen的含量。Highly ordered mesoporous material MCM-41A（after calcination） and MCM-41B（before calcination） were synthesized in ethylenediamine（EDA） medium at room temperature,and the rare earth complexes Tb（aspirin）3phen which had been heat treated as an active optical guest was incorporated into the one-dimensional channels of MCM-41A（B）.The photoluminescence properties of the organic/inorganic composites Tb（aspirin）3phen-MCM-41A（B） were investigated based on the analyses of excitation and emission spectra to provide information about the relationship between the organic host and the inorganic optical guest.The results from the characterization of PL show that the wide excitation band in the range of 240-375 nm of Tb（aspirin）3phen is assigned to the carbonyl group n→π＊ transition absorption,benzene ring π→π＊ transition absorption of aspirin,and phenanthrene absorption of phen.As no excitation band appears in ultraviolet ranges,the characteristic emission peaks of Tb3＋ in the emission spectra are related to antenna effect.Relative to the excitation band of Tb（aspirin）3phen,the excitation band of Tb（aspirin）3phen-MCM-41B and Tb（aspirin）3phen/MCM-41A splits obviously,and only one narrow excitation peak at 353 nm appears in the excitation spectrum of Tb（aspirin）3phen-MCM-41A.The excitation bands of Tb（aspirin）3phen-MCM-41B and Tb（aspirin）3phen/MCM-41A at short wavelength weakens and disappears gradually,while excitation peaks at long wavelengths is enhanced gradually,and the IL/ILn ratio I,where IL is the emission intensity at 405 nm under 335 nm excitation,and ILn is the emission intensity at 544 nm under 335 nm excitation,also decreases correspondingly.It is suggested that the triplet states and single states of aspirin and phen reduce with different degree after Tb（aspirin）3phen is banded with MCM-41 framework,and the effect of silicon framework on the states of phen is more than that of aspirin.The degree of the effect on the states of organic ligands i

关 键 词：MCM-41 Tb(aspirin)3phen 光致发光 性能 影响 

分 类 号：O482.3[理学—固体物理]