【作者】 张毅； 武莉； 易欢； 孔勇发； 许京军；

【Author】 Yi Zhang;Li Wu;Huan Yi;Yongfa Kong;Jingjun Xu;College of Electronic Information and Optical Engineering and Tianjin Key Laboratory of Photoelectronic Thin Film Devices and Technology,Nankai University;The MOE key laboratory of weak-Light Nonlinear Photonics,School of Physics,Nankai University;

【机构】 南开大学电子信息与光学工程学院； 南开大学物理学院；

【摘要】 NaSrBO₃是我们小组武莉教授在2006年发现并解析的一个新化合物,已被证实是一种性能优良的LED用荧光基质材料。但是,我们最近发现,NaSrBO₃在120℃时会发生相变:低温相α-NaSrBO₃和高温相β-NaSrBO₃。通过Na+或Ce3+等离子掺杂,成功的将高温相β-NaSrBO₃稳定到室温,并采用粉末从头算法解析了β-NaSrBO₃。该高温相的空间群为P2₁/c,晶胞参数为:a=6.06214（8）A,b=5.41005（7）A,c=9.1468（1）A,β=102.1 16（1）°,V=293.301（7）A³。Na和Sr互占位,[BO₃]^3-基团平行排列。随后,研究了β-NaSrBO₃:Ce³⁺的荧光性质,发现它是一种蓝色荧光粉,且在LED工作温度区间的荧光性质优于α-NaSrBO₃:Ce³⁺的相应荧光性质。当用近紫外芯片激发该荧光粉和其它商用粉,获得了色度坐标为（0.3821,0.3430）、显色指数为92.8、色温为3654K的暖白光LED,证明β-NaSrBO₃:Ce³⁺是一种性能优良、可商用的蓝色荧光粉。更多还原

【Abstract】 α-NaSrBO₃ is a promising phosphor host for phosphor-converted w-LED application with very interesting properties.However,it will undergoes a phase transformation to β-NaSrBO3 at LED working temperature.In this study,the high temperature phase β-NaSrBO3 was stabilized to room temperature by introducing Na⁺ and Ce³⁺ via high-temperature solid-state reaction method.The crystal structure of β-NaSrBO₃ was determined from the powder X-ray diffraction data.It crystallizes in the space group P2₁/c with the lattice parameters:a=6.06214（8） A,b=5.41005（7） A,c=9.1468（1）A,β=102.116（1）°,and V=293.301（7） A³.Na and Sr sites are found to be mixed occupied by each other and the isolated[BO₃]^3- anionic groups are distributed in parallel.Ce³⁺ activated β-NaSrBO₃:Ce³⁺blue-emitting phosphors were synthesized.The temperature-dependent PL spectra indicate that the thermal stability of β-NaSrBO₃:Ce³⁺ is better than that of α-NaSrBO₃:Ce³⁺ at the same temperature.A near-ultraviolet pumped warm w-LED with β-NaSrBO₃:0.05Ce³⁺ phosphor as the blue component was fabricated.The w-LED lamp after illumination at 250 mA gives chromaticity coordinate,color rendering index and correlated color temperature of（0.3821,0.3430）,92.8,and 3654 K,respectively.更多还原