Preparation And Fluorescence Properties Of Two Kinds Of The Inorganic Materials Doped With Rare Earth

Recently,rare earth luminescent materials paly an important role in lighting,display and detection.The development of high-performance rare earth luminescent materials is a major national strategy.Energy conservation and environmental protection are important research objectives,white light emitting diode?LEDs?has become the fourth generation lighting source due to its advantages,such as energy saving,environmental friendly,long lifetime and panal fabiraction.Luminescent phosphor is one of the most key technologies of white LEDs.At present,the blue LED combined with the YGA:Ce³⁺yellow phosphors for white LEDs have been commercialized.But unfortunately,it has low color rendering index,therefore,it can not meet the requirements for light indoor.Our study aims to develop the phosphor with a single-phased host and a single activator.This work have application for white LEDs.On the other hand,temperature is a basic and frequent physical parameter in our life,so temperature measurement is very important.But,traditional contact temperature measurement is not suitable for many cases.The research and development of non-contact temperature sensors with high sensitivity,high resolution and fast response are in urgent need.The contents and conlusions of this article is as following:Firstly,a series of Ca4Y6O?SiO4?6:x%Dy³⁺?x=1,3,5,7,9?phosphors were synthesized successfully via a conventional solid-state method at high temperature.The blue(⁴F_9/2?⁶H_15/2)and yellow(⁴F_9/2?⁶H_13/2)emissions of Ca₄Y₆O?SiO₄?₆:7%Dy³⁺phosphors were of such a ratio that almost perfect white light with CIE coordinates of?0.330,0.339?was produced.Both the emission intensity and the CIE coordinates exhibit an excellent thermal stability in the temperature range of room temperature?RT?-300?.Our study illustrates that Ca4Y6O?SiO4?6:7%Dy³⁺may serve as potential warm white lighting phosphors in NUV-based solid state lighting and optical display applications.Secondly,a series of Eu³⁺substituted hydroxyapatite?HA?were prepared by co-precipitation reactions.The phase,fluorescence and temperature dependent luminescence of the phosphors were investigated by X-ray diffraction?XRD?and photoluminescence?PL?.It is found that the doped Eu³⁺ions have entered the hexagonal lattice with no obvious secondary phase were detected by XRD.The ⁵D0?⁷F0 transition was clearly split into two even at room temperature.The predominate 573 nm peak illustrates Eu³⁺ions occupy Ca?II?sites more.The temperature dependent luminescent results show HA:Eu³⁺might be applied as one potential optical thermometry material.Lastly,pure hydroxyapatite was prepared using a low cost raw materials?pig femur?.A series of Eu³⁺-doped HA phosphors were synthesized by the high temperature solid-state reaction method.The produced HA was characterized by X-ray diffraction?XRD?,the photoluminescence excitation and emission spectra.The temperature dependence of the HA was studied of temperature-dependent emission and excitation spectra.The results show that in range of 298 K-573 K,the phosphor exhibits the sensitivity of 0.627%K^-1,which indicate that the HA might be an excellent temperature sensing material.