材料工程Issue(3)：24-27,4.
白光LED用新型红色荧光粉Li2SrSiO4:Eu3+的合成及性质
Synthesis and Properties of Novel Red-emitting Phosphor Li2SrSiO4 : Eu3+ for White LED
摘要
Abstract
A novel red-emitting phosphor Li2SrSiO4 :Eu3+ was synthesized by gel-combustion method, using the metal nitrates as raw materials, and tetraethoxysilane as silica source. The formation process,structure and luminescence properties of as-synthesized Li2SrSiO4 :Eu3+ were investigated by FI-IR, XRD and fluorescence spectrophotometer respectively. The results show that the goal product Li2SrSiO4 :Eu3+ can be obtained after the precursor obtained from the combustion of dry gel was calcined at 700℃ for 3h. The as-synthesized sample has hexagonal crystal structure and P3121 space group, and unit cell parameter is a = 0. 5012nm, c= 1. 2360nm. The excitation spectrum shows a broad band, and the strongest excitation peak is at 396 nm. The strongest emission peak is at 618 nm, which is ascribed to 5 D0→7F2 characteristic transition of Eu3+ . When the mole fraction x of doped Eu3+ is in the range of 0. 04-0.24, the luminescence intensity of the sample increases gradually with the the increase of Eu3+ concentration. It is interesting that no concentration quenching occurs. The synthesized phosphor can absorb near-UV light around 396nm effectively, so it is a suitable red-emitting phosphor for white light-emitting diodes excited by 350-410nm InGaN chip.关键词
Li2SrsiO4:Eu3+/红色荧光粉/白光发光二极管/凝胶-燃烧法Key words
Li2SrSiO4: Eu3+/ red-emitting phosphor/ white light-emitting diodes/ gel-combustion method分类
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翟永清,王欣,冯仕华,刘毅兰,游志江..白光LED用新型红色荧光粉Li2SrSiO4:Eu3+的合成及性质[J].材料工程,2011,(3):24-27,4.基金项目
国家自然科学基金资助项目(20675023) （20675023）
