【摘要】 高温固相法合成了KNaCa2(PO4)2:Eu2+,Mn2+荧光粉,并探讨其发光性质和Eu2+-Mn2+间的能量传递。Eu2+的470 nm发射峰源于Eu2+的5d-4 f跃迁,最佳掺杂浓度为0.01 mol,Eu2+的激发峰位于400 nm,与UV-LED管芯的发射光谱(350~410 nm)匹配。Mn2+的565和618 nm的发射来自Mn2+的4T1(4G)-6A1(6S)跃迁。KNaCa2(PO4)2:0.01Eu2+,nMn2+系列样品中,随着Mn2+浓度的增加,Eu2+的发射峰逐渐降低,Mn2+的发射峰逐渐增强,Eu2+对Mn2+的发光有明显的敏化作用。根据D exter电多极相互作用能量传递公式,可得出Eu2+与Mn2+之间的能量传递归因于电偶极-电四极相互作用引起的共振能量传递。更多还原

【Abstract】 The KNaCa2(PO4)2: Eu2+,Mn2+ phosphor was synthesized by high temperature solid state reaction.The luminescence properties and the energy transfer from Eu2+ to Mn2+ were investigated.The emission spectra of KNaCa2(PO4)2:Eu2+ showed a single intense band centered at 470 nm,which corresponded to the 4f65d1→4f7 transition of Eu2+.The excitation spectra of KNaCa2(PO4)2:Eu2+ peaked at 400 nm,which coupled well with the emission of ultraviolet light-emitting diodes(UV-LEDs).The emission spectra of Mn2+ centered at 565 nm and 618 nm corresponded to 4T1(4G)-6A1(6S) transition.With the increasing of Mn2+ content,the intensity of Eu2+ emission was decreased and the intensity of Mn2+ emission was simultaneously increased.This phenomenon suggested that Mn2+ ion was sensitized by Eu2+ ion,in other words,there was an energy transfer from Eu2+ to Mn2+ in KNaCa2(PO4)2.According to Dexter′s energy transfer formula,the energy transfer between Eu2+ and Mn2+ was due to the electric dipole-quadripole interaction of the resonance transfer.更多还原