【摘要】 无铅双钙钛矿材料具有高效、稳定的自陷激子发射，在下一代固态照明中显示出巨大的潜力。本文采用微波固相法制备出系列新型的Cs₂NaGdCl₆∶Sb³⁺蓝色荧光粉。通过X射线衍射仪、扫描电子显微镜和荧光光谱仪对所制备样品的结晶性、微观形貌和发光性能进行了表征和分析。结果表明，所制备的双钙钛矿型Cs₂NaGdCl₆∶Sb³⁺样品属于立方晶系，空间群Fm3m，大小为10μm的不规则颗粒。在336 nm激发光下，荧光粉在460 nm处发射出极强的蓝光，且不同Sb³⁺离子掺杂浓度的样品色坐标均在蓝光区域。当Sb³⁺离子掺杂浓度超过0.015时，发生浓度猝灭，归因于电偶极-电偶极相互作用。此外，Cs₂NaGd_0.985Cl₆∶0.015Sb³⁺样品具有较佳的热稳定性，当温度升高至423 K时，发光积分强度仍为323 K时的72.6%。基于上述研究结果，Sb³⁺离子激活Cs₂NaGdCl₆蓝色荧光粉在发光二极管领域具有潜在的应用价值。更多还原

【Abstract】 Lead-free double perovskite materials exhibiting efficient and stable self-trapped exciton emissions hold significant promise for the advancement of next-generation solid-state lighting technologies.Novel blue-emitting phosphors (Cs₂NaGdCl₆∶Sb³⁺) were synthesized through a microwave-assisted solid-phase technique.The samples were subjected to an analysis of their crystallinity,microscopic morphology,and luminescent properties through X-ray diffractometer,scanning electron microscopy,and fluorescence spectrometer.The results reveal that the synthesized double perovskite Cs₂NaGdCl₆∶Sb³⁺phosphors crystallize in the cubic space group Fm3m and comprise irregular particles with sizes in the tens of microns range.When excited by 336 nm light,phosphors show remarkably intense blue light emission at 460 nm,the color coordinates of samples with varying Sb³⁺ion doping concentrations reside within the range of blue light.When doping concentration of Sb³⁺ions exceeds 0.015,concentration quenching occurs due to the electric dipole-dipole interaction.Furthermore,the Cs₂NaGd_0.985Cl₆∶0.015Sb³⁺sample exhibits excellent thermal stability.Its integrated luminescence intensity remains at 72.6%when temperature increases to 423 K from 323 K.The research findings suggest that Sb³⁺ ions activated Cs₂NaGdCl₆ blue-emitting phosphors hold promise for applications in light-emitting diodes.更多还原