title: Crystal structure and luminescence properties of the blue-green-emitting Ba9(Lu, Y)2Si6O24:Ce3+phosphor.
abstract: Samples of the Ba9(Lu2-xYx)Si6O24:Ce3+(x = 0-2) blue-green phosphors were synthesized by solid-state reactions. All the samples exhibited a rhombohedral crystal structure. As the Y3+concentration increased, the diffraction peaks shifted to the small angle region and the lattice parameters increased due to the larger ionic radius of Y3+(r = 0.900 Å) compared with that of Lu3+(r = 0.861 Å). Under 400 nm excitation, samples exhibited strong blue-green emissions around 490 nm. The emission bands had a slight blue shift that resulted from weak crystal-field splitting with increasing Y3+concentration. Luminescence intensity and quantum efficiency (QE) decreased with increasing Y3+concentration. The internal QE decreased from 74 to 50% and the external QE decreased from 50 to 34% as x increased from 0 to 2. The thermal stability of the Lu series was better than that of the Y-series. The excitation band peak around 400 nm matched well with the emission light from the efficient near-ultraviolet (NUV) chip. These results indicate promising applications for these NUV-based white light-emitting diodes.
authors.affiliation: The Fifth Research Institute of MIIT, Quality Inspection and Testing Center, No. 110 Dongguan Zhuang Road, Guangzhou, China.
authors.forename: Huawei
authors.initials: H
authors.lastname: Xu
authors.affiliation: College of Science, Hunan Agricultural University, No. 1 Nongda Road, Changsha, China.
authors.forename: Zhi
authors.initials: Z
authors.lastname: Zhou
authors.affiliation: Ningbo Institute of Materials Technology and Engineering (NIMTE), Chinese Academy of Sciences (CAS), No. 1219 Western Zhongguan Road, Ningbo, China.
authors.forename: Yongfu
authors.identifier: http://orcid.org/0000-0002-9502-5897
authors.initials: Y
authors.lastname: Liu
authors.affiliation: The Fifth Research Institute of MIIT, Quality Inspection and Testing Center, No. 110 Dongguan Zhuang Road, Guangzhou, China.
authors.forename: Qunxing
authors.initials: Q
authors.lastname: Liu
authors.affiliation: The Fifth Research Institute of MIIT, Quality Inspection and Testing Center, No. 110 Dongguan Zhuang Road, Guangzhou, China.
authors.forename: Zhiyuan
authors.initials: Z
authors.lastname: He
authors.affiliation: The Fifth Research Institute of MIIT, Quality Inspection and Testing Center, No. 110 Dongguan Zhuang Road, Guangzhou, China.
authors.forename: Shen
authors.initials: S
authors.lastname: Wang
authors.affiliation: The Fifth Research Institute of MIIT, Quality Inspection and Testing Center, No. 110 Dongguan Zhuang Road, Guangzhou, China.
authors.forename: Linyi
authors.initials: L
authors.lastname: Huang
authors.affiliation: Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, No. 3888, Nanhu Road, Changchun, 130033, China.
authors.forename: Hongbo
authors.initials: H
authors.lastname: Zhu
mesh_terms: D002563:Cerium / Q000737:chemistry; D003116:Color; D003460:Crystallization; D049408:Luminescent Agents / Q000737:chemistry*; D008163:Luminescent Measurements; D008187:Lutetium / Q000737:chemistry; D011208:Powders; D014961:X-Ray Diffraction
chemical_list: D049408:Luminescent Agents; D011208:Powders; D002563:Cerium; D008187:Lutetium
keywords: Ce3+ luminescence; blue-green phosphor; near ultraviolet; silicate; white LEDs