title: Self-Activated Yellow Light Emitting Phosphors of α, β-Ca3B2N4with Long Afterglow Properties.
abstract: Defect luminescence has been considered to be one of the most efficient ways to resolve the problem of the recent limited supply and increased demand for rare-earth elements. So, in this work, a novel self-activated long-persistent green-yellow and yellow emitting phosphors of α-Ca3B2N4and β-Ca3B2N4has been successfully synthesized by sample-pressuring sintering. The α-Ca3B2N4and β-Ca3B2N4all have a broad excitation band peaked at 300 and 350 nm and emit yellow-green light peaked at 550 nm and yellow light peaked at 575 nm respectively with the long afterglow properties. The crystal structures and electron structures of α-Ca3B2N4and β-Ca3B2N4have been investigated to show that orthorhombic β-Ca3B2N4corresponds to an ordered superstructure of cubic α-Ca3B2N4and the phase transformation between α-Ca3B2N4and β-Ca3B2N4would happen during the preparation process, which produces many intrinsic defects forming the luminescent center. The thermoluminescence (TL) curve shows that there are traps in the host lattice with the TL peak located at 310 K. The results indicate that α-Ca3B2N4and β-Ca3B2N4with the defect-related PL and LPL properties have potential applications in the LED and LPL used phosphors.
authors: Key Laboratory for Special Function Materials and Structural Design of the Ministry of Education, School of Physical Science and Technology, Lanzhou University , Lanzhou 730000, China.
authors: Jianyan
authors: J
authors: Ding
authors: Key Laboratory for Special Function Materials and Structural Design of the Ministry of Education, School of Physical Science and Technology, Lanzhou University , Lanzhou 730000, China.
authors: Quansheng
authors: Q
authors: Wu
authors: Key Laboratory for Special Function Materials and Structural Design of the Ministry of Education, School of Physical Science and Technology, Lanzhou University , Lanzhou 730000, China.
authors: Yanyan
authors: Y
authors: Li
authors: Key Laboratory for Special Function Materials and Structural Design of the Ministry of Education, School of Physical Science and Technology, Lanzhou University , Lanzhou 730000, China.
authors: Qiang
authors: Q
authors: Long
authors: Key Laboratory for Special Function Materials and Structural Design of the Ministry of Education, School of Physical Science and Technology, Lanzhou University , Lanzhou 730000, China.
authors: Yichao
authors: Y
authors: Wang
authors: Key Laboratory for Special Function Materials and Structural Design of the Ministry of Education, School of Physical Science and Technology, Lanzhou University , Lanzhou 730000, China.
authors: Xinlong
authors: X
authors: Ma
authors: Key Laboratory for Special Function Materials and Structural Design of the Ministry of Education, School of Physical Science and Technology, Lanzhou University , Lanzhou 730000, China.
authors: Yuhua
authors: Y
authors: Wang