Cao Renping, Liang Tao, Li Wensheng, Cao Chunyan, Wen Yufeng, Hu Qianglin
College of Mathematics and Physics, Jinggangshan University, Ji'an 343009, China.
College of Mathematics and Physics, Jinggangshan University, Ji'an 343009, China.
Spectrochim Acta A Mol Biomol Spectrosc. 2015 Jul 5;146:38-42. doi: 10.1016/j.saa.2015.03.036. Epub 2015 Mar 13.
Sr[1-3(x+y)/2]Al2B2O7:xEu(3+), yBi(3+) (x=0-5 mol% and y=0-5 mol%) phosphors are synthesized by a solid-state reaction method in air, and their crystal structure, fluorescence lifetime, and luminescence properties are investigated. The optimal composition is determined to be (Sr0.94Eu0.03Bi0.01)Al2B2O7. The PLE band peaks within the range 200-550 nm are due to O(2-)→Eu(3+) charge transfer band, (7)F0→(5)H3, (5)D4, (5)L7, (5)L6, (5)D3, (5)D2, and (5)D1 transitions, respectively. The strongest PL band peak under excitation 394 nm light is at ∼615 nm owing to (5)D0→(7)F2 transition of Eu(3+) ion. The PL intensity of Eu(3+), Bi(3+) co-doped SrAl2B2O7 phosphor is 1.3 times that of Eu(3+) doped SrAl2B2O7 phosphor due to the energy transfer between Eu(3+) and Bi(3+) ions, which is explained by the energy level diagrams of Bi(3+) and Eu(3+) ions. The CIE chromaticity coordinates of Sr0.955Al2B2O7:0.03Eu(3+) and Sr0.94Al2B2O7:0.03Eu(3+), 0.01Bi(3+) phosphors under excitation 394 nm light are (x=0.6292, y=0.3702) and (x=0.6284, y=0.3711), respectively. These phosphors will be used as reddish orange emitting phosphor candidate for white LED with ∼394 nm near ultraviolet LED chip.
通过固态反应法在空气中合成了Sr[1 - 3(x + y)/2]Al2B2O7:xEu(3+), yBi(3+)（x = 0 - 5 mol%且y = 0 - 5 mol%）荧光粉，并对其晶体结构、荧光寿命和发光性能进行了研究。确定最佳组成为(Sr0.94Eu0.03Bi0.01)Al2B2O7。200 - 550 nm范围内的PLE带峰分别归因于O(2-)→Eu(3+)电荷转移带、(7)F0→(5)H3、(5)D4、(5)L7、(5)L6、(5)D3、(5)D2和(5)D1跃迁。在394 nm光激发下最强的PL带峰位于约615 nm处，这是由于Eu(3+)离子的(5)D0→(7)F2跃迁。由于Eu(3+)和Bi(3+)离子之间的能量转移，Eu(3+)、Bi(3+)共掺杂SrAl2B2O7荧光粉的PL强度是Eu(3+)掺杂SrAl2B2O7荧光粉的1.3倍，这由Bi(3+)和Eu(3+)离子的能级图进行了解释。在394 nm光激发下，Sr0.955Al2B2O7:0.03Eu(3+)和Sr0.94Al2B2O7:0.03Eu(3+), 0.01Bi(3+)荧光粉的CIE色度坐标分别为(x = 0.6292, y = 0.3702)和(x = 0.6284, y = 0.3711)。这些荧光粉将用作具有约394 nm近紫外LED芯片的白光LED的红橙色发光荧光粉候选材料。
