Preparation Of Colour-tunable Single-phased Ba₃Y?PO₄?₃ Phosphors Based On Energy Transfer

A series of Ce³⁺/Eu²⁺,Ce³⁺/Mn²⁺,Ce³⁺/Eu²⁺/Mn²⁺,Ce³⁺/Tb³⁺,Ce³⁺/Eu³⁺,Tb³⁺/Eu³⁺,Ce³⁺/Tb³⁺/Eu³⁺,Tb³⁺/Mn²⁺and Ce³⁺/Tb³⁺/Mn²⁺co-doped and tri-doped Ba₃Y?PO₄?₃?BYP?phosphors were synthesized by traditional high temperature solid state method.XRD,crystal structure,luminescence properties,energy transfer and temperature properties of the synthesized samples were analyzed in detail.The luminescent properties of phosphors were modulated by energy transfer between different ions in ion pairs.The main research contents are as follows:?1?Ce³⁺/Eu²⁺,Ce³⁺/Mn²⁺and Ce³⁺/Eu²⁺/Mn²⁺ion pairs co-doped and tri-doped Ba₃Y?PO₄?₃ hosphors materials(abbreviated as BYP:0.14Ce³⁺,xEu²⁺;BYP:0.14Ce³⁺,yMn²⁺and YP:0.14Ce³⁺,xEu²⁺,0.14Mn²⁺)were synthesized by high temperature solid-state reaction. he XRD,energy transfer,luminescence properties and temperature properties of the ynthesized samples were studied and analyzed in detail.The energy transfer from Ce³⁺to u²⁺and from Ce³⁺to Mn²⁺had been confirmed,the calculation shows that the energy ransfer mechanism between Ce³⁺and Eu²⁺and between Ce³⁺and Mn²⁺is dipole-dipole nteraction.In BYP:0.14Ce³⁺,yMn²⁺,due to the existence of defects,the abnormal changes n the temperature spectrum occurred,and we obtained a group of colour-tunable hosphors with good temperature performance.In BYP:0.14Ce³⁺,xEu²⁺,0.14Mn²⁺,there are three groups of energy transfer:Ce³⁺to Eu²⁺(Mn²⁺)and Eu²⁺to Mn²⁺.The priority of energy transfer among the three ions was discussed through the analysis of the intensity of emission spectrum.In addition,the samples contains blue,yellow and red at the same time, and the emission spectrum covers the whole visible wavelength,so we finally obtained a single phase phosphor which can emit warm white light.?2?A series of Ce³⁺/Tb³⁺,Ce³⁺/Eu³⁺,Tb³⁺/Eu³⁺and Ce³⁺/Tb³⁺/Eu³⁺ion pairs co-doped and tri-dopedBa₃Y?PO₄?₃phosphors(abbreviatedasBYP:0.05Ce³⁺,xTb³⁺; BYP:0.40Tb³⁺,yEu³⁺;BYP:0.05Ce³⁺,yEu³⁺and BYP:zCe³⁺,0.4Tb³⁺,0.13Eu³⁺)were synthesized by high temperature solid-state method.We studied the XRD diffraction patterns,energy transfer properties,luminescence properties and temperature properties of the synthesized samples.By the dipole-dipole interaction,energy transfer from Ce³⁺to Tb³⁺and from Tb³⁺to Eu³⁺can be realized.Under the effect of energy transfer,two groups of color-tunable phosphors were obtained.In Ce³⁺and Eu³⁺co-doped samples,due to the non-radiative transition of Eu³⁺,the red emission of Eu³⁺is very weak,but the energy transfer between them can also be determined.Due to the lack of Eu³⁺luminescence performance,the luminescence performance of this group of samples was limited.In Ce³⁺/Tb³⁺/Eu³⁺tri-doped samples,the emission spectra cover blue,green and red wave bands.A group of single phase phosphor which can emit white light are obtained,and the color temperature can be adjusted to a certain extent under the effect of energy transfer. Under the action of defects,abnormal phenomena appeared in the temperature spectra of all phosphors,especially in white light phosphors.Finally,a group of phosphors with colour-tunablity and high temperature stability were obtained,which showed high application potential in the field of white LED.?3?We synthesized Tb³⁺/Mn²⁺,Ce³⁺/Tb³⁺/Mn²⁺ion pairs co-doped and tri-doped Ba₃Y?PO₄?₃ phosphors(abbreviated as BYP:0.4Tb³⁺,yMn²⁺and BYP:zCe³⁺,0.4Tb³⁺,0.12Mn²⁺).The XRD patterns,energy transfer,luminescence and temperature properties of the synthesized samples were studied and analyzed in detail.The energy transfer between Tb³⁺and Mn²⁺in BYP:0.4Tb³⁺,yMn²⁺was determined through the change of emission peak intensity of the spectra and lifetime of ions.The energy transfer mechanism was the interaction between multipole-multipole,and a group of phosphors whose colour can be regulatedfromyellow-greentowarmwhitewasobtained.In BYP:zCe³⁺,0.4Tb³⁺,0.12Mn²⁺,a single-phased white light phosphor with a set of colour coordinates throughout the entire white light region was obtained through the energy transfer among three ions.In addition,basing on the existence of defects in the sample, the obtained white phosphor has good temperature stability.In short,the obtained phosphors have strong colour temperature adjustablity and good temperature stability,and it have a high potential value in the application of white LED.