Constructed And Study On Luminescence Properties Of Metal Oxide Based Luminescent Materials

Porous materials have attracted extensive attention from scholars due to their high specific surface area and ordered porous structure.As a luminescent material,the rare earth element complex has a narrow emission peak,a high quantum efficiency and unique luminescent properties.The sharp and intense emission lines was produced when it was exposed in ultraviolet light.This dissertation has studied from the following aspects:In this study,Eu?TTA?₃?TPPO?₂ was assembled in the ordered porous ZnO matrix by an ultrasonic-assisted liquid phase method,and a kind of monodispersed and regular hemispherical ordered porous Eu?TTA?₃?TPPO?₂/ZnO composite was prepared.The hemispherical particles had a diameter of about 1?m,whose surface distributed a large number of ordered pores,and the pore size was about 2.18 nm.In the prepared process,the ordered mesoporous ZnO must be used as a precursor,the Eu?TTA?₃?TPPO?₂ guest material acted as also a structure-directing agent,resulted in rearrangement of the porous ZnO particles,and obtained a hemispherical appearance.ZnO had a strong emission peak at 469nm,which overlapped with the ⁷F₀-⁵D₂ transition excitation peak of Eu³⁺at 465 nm,and an effective energy transfered between ZnO and Eu³⁺,which strongly enhanceed the luminescence intensity of Eu³⁺.The luminescent properties of the prepared materials were investigated by studying luminescence spectroscopy.The effect of Eu³⁺concentration on the luminescent properties of the prepared materials was also investigated.The optimal ratio of Eu³⁺concentration was determined.In this study,the Eu³⁺organic complex Eu?TTA?₃?TPPO?₂ was assembled into the ordered porous ZnO matrix by solvothermal method,and the ordered porous Eu?TTA?3?TPPO?2/ZnO composite was prepared.The material retained the ordered porous structures of the ZnO host,whose morphology was irregular spherical particles,the guest material was mainly distributed in the pores of the ZnO matrix.The properties of the Eu?TTA?₃?TPPO?₂/ZnO composite material was investigated,two upconversion luminescence peaks at 465 nm and 615 nm were showed in prepared material.According to the luminescence intensity of the material,the optimal ratio of Eu³⁺concentration in the prepared material was determined.With the increase of Eu³⁺content,the upconversion luminescence intensity of ZnO at 465 nm was sharply enhanced,the upconversion luminescence intensitys of Eu³⁺at 465 and 590 nm were also enhanced,but the upconversion luminescence intensitys of Eu³⁺at 485 and 512 nm were receded.It could be deduced that Eu³⁺transferred a part of absorbed energy to ZnO,which lead to the upconversion luminescence intensitys weaken of the peaks.When the content of Eu³⁺was12 wt%,the luminescence intensity reaches a maximum.In this study,the sol-gel method was used to assemble the Eu³⁺organic complex Eu?TTA?3?TPPO?2 into the pores of disordered porous tin dioxide,and Eu?TTA?3?TPPO?2/SnO₂ composite material was prepared.The material showed gel block structure which was heaped with the SnO₂ aerogel particles,a large number of disordered pores were distributed on the surface of the prepared material.According to the process of aerogel forming,the guest material Eu?TTA?3?TPPO?2 was completelyed distributed in the pores of mesoporous SnO₂.The luminescent properties of the prepared materials were investigated,its excitation spectrum showed the strongest excitation at 368 nm,and the strongest emission was showed at 615 nm.The effect of the Eu³⁺content on the luminescence properties of the samples was investigated.According to the luminescent intensity of the material,the optimal proportion of Eu³⁺in the prepared material was determined.With the increase of Eu³⁺content,the luminescence intensity of the sample was increased,and the luminescence intensity reached the maximum when the content of Eu³⁺was 6 wt%.In this study,the disordered porous ZnO/SnO₂ composite matrix was prepared by sol-gel template method.Then,the prepared ZnO/SnO₂ was used as the carrier,and the rare earth complex Eu?TTA?₃?TPPO?₂ was loaded into the pores of the ZnO/SnO₂ matrix by hydrothermal method,and the Eu?TTA?₃?TPPO?₂/ZnO-SnO₂ composite luminescent material was obtained.The prepared material showed square rutile SnO₂ structure,the structure showed an analogous floriform loose gel mass structure which was constituted with gel tablets,and the gel tablets was constituted with SnO₂ gel particles whose diameter was about 210 nm.The effect of on the luminescence properties of Eu was studied.With the increase of ZnO content,the emission intensity of became stronger,and the luminescence intensity reached the maximum when the contents of ZnO and Eu³⁺were 20wt%and 6 wt%.