Study On The Luminescence Properties Of Niobate Warm White Light Phosphors Based On Energy Transfer Acquisitio

Niobate material,as an environmentally friendly substance,is widely used in the field of phosphorescent materials due to its excellent physical properties,optical properties and chemical stability.In this paper,Ca₂YNb O₆ double perovskite was selected as the host material for the synthesis of single-phase warm white phosphors,and a series of phosphor materials doped with Dy³⁺ions and Dy³⁺-Sm³⁺,Dy³⁺-Eu³⁺ions were synthesized using a high-temperature solid-state method.The phase spectrum,crystal structure,microscopic morphology,photoluminescent properties,and thermal stability of the phosphor are studied and analyzed in detail.1.A new type of double perovskite Ca₂YNb O₆:xmol Dy³⁺yellow-white phosphor was synthesized by high-temperature solid-phase method.The phase and microscopic morphology of the samples were analyzed by XRD and SEM.Through the test and analysis of the photoluminescence characteristics of the sample,it is known that the optimal Dy³⁺ion doping concentration is at x=0.05mol,and the blue emission at 483nm(⁴F_9/2→⁶H_13/2)can be produced under the excitation of a 353nm light source and yellow emission at 575 nm(⁴F_9/2→⁶H_13/2).The concentration quenching of phosphors is due to dipole-dipole interactions.Ca₂YNb O₆:0.05Dy³⁺has very good thermal stability,and still has 84.1%luminous intensity at 425K.2.A new type of double perovskite Ca₂YNb O₆:0.05Dy³⁺,ymol Sm³⁺warm white phosphor was synthesized by high temperature solid state method.With the increase of Sm3+ion concentration,the characteristic emission peak intensity of Dy³⁺ion decreases gradually,and the characteristic emission peak intensity of Sm³⁺ion increases first and then decreases.The optimal doping concentration of Sm³⁺ion is y=0.05mol.The reason for the concentration quenching of Sm³⁺ions is caused by the dipole-dipole interaction.The energy transfer between Dy³⁺-Sm³⁺inside the Ca₂YNb O₆ host lattice is carried out through the dipole-quadrupole interaction,and the energy transfer efficiency increases with the Sm³⁺The ion concentration increases,gradually increasing from 47%to 74%.3.A new type of double perovskite Ca₂YNb O₆:0.05Dy³⁺,zmol Eu³⁺warm white phosphor was synthesized by high temperature solid phase method.The optimal doping concentration of Eu³⁺ions is at z=0.2mol.The way of energy transfer is realized by quadrupole-quadrupole interaction,and the energy transfer efficiency increases from27%to 94%with the increase of Eu³⁺ion concentration.The concentration quenching of Eu³⁺ions is caused by dipole-dipole interactions.The change of the emission peak of the sample has two different trends with the increase of temperature.After modeling with FIR technology,the relative sensitivity and absolute sensitivity of the sample are analyzed,Max-Sr=3.14%k^-1,Max-Sa=0.469%k^-1,and the temperature fuzzy calculation and hot and cold cycle test are carried out on the sample,the results show that it has good optical temperature measurement characteristics.