Study On Properties Of Photoluminescence Of Mesoporous MCM-41 Assembling Body

Rare earth ions and organic materials with mesoporous MCM-41 assembled into assemblies, which has important applications in catalytic converter, optical switching and micro-sensors fields, were caused attention by researchers in recent years.High ordered mesoporous material MCM-41 was synthesized in ammonia medium at room temperature, and the rare earth complexes were incorporated into the one-dimensional channels of MCM-41. A series of MCM41-salicylic acid, and MCM41-salicylic acid-Tb3+ MCM41-Eu(Bz)3, MCM41-Tb(Asal)3phen were prepared in the ammonia system. The structure and properties were characterized by XRD, IR, Raman, TG-DTA, N2 absorption-desorption, excitation and emission spectrum. The property of photoluminescence and energy transfer between rare earth ion and complexes as well as the relationship between the organic host and the inorganic optical guest were also studied.As doping concentration of 0.025g, salicylic acid was the most luminous. The concentration of Tb3+ played a sensitization role to salicylic acid, and shown anti-transfer phenomenon. The ourgoing light intensity and the incidence light intensity assume non-linear relationship. In mesoporous assembly body of MCM-41 and binary rare-earth organic complexes MCM41-Eu(Bz)3 systerm, Eu(Bz)3 can be bonded with the hydroxyl in the channel, thus the vibration energy of hydroxyl is reduced, then the luminescence of Eu3+ is enhanced effectively. Eu(Bz)3 has a stronger absorption of the excitated light in the assembly since the existence of MCM-41,MCM41-Eu(Bz)3 has a more excellent luminescence property than that of Eu(Bz)3.In mesoporous assembly body of MCM-41 and ternary rare-earth organic complexes MCM41-Tb(Asal)3phen system, the MCM-41 surface crystal field has great effect on matching only important state of body and triple state energy level, the efficiency of the energy that second matches body phen S1 state to Tb3+ increases, and makes the intensity of fluorescence launch of Tb3+ strengthen. When Yb3+ in the inorganic base material MCM-41 framework, Tb(Asal)3 phen and MCM-41 assembling experience and observe glowing object Tb (Asal)3 phen competes with the MCM-41 assembling queen, whose luminescence intensity in Tb (Asal) having improved four times. Luminescence intensity of the assembling body is strengthened, as Yb/Si=7.579×10-3, the luminescence intensity is maximal.