title: A single-component white-emitting CaSr2Al2O6:Ce3+, Li+, Mn2+ phosphor via energy transfer.
abstract: A series of single-component Ce(3+), Li(+), Mn(2+) ions codoped color-tunable CaSr2Al2O6 phosphors were synthesized by a high-temperature solid-state reaction, and the photoluminescence properties as well as the energy transfer mechanism from Ce(3+) to Mn(2+) ions have been investigated in detail. The Ce(3+) activated phosphors have strong absorption in the range of 250-420 nm and can give a blue emission centered at about 460 nm. When Mn(2+) ions are codoped, the emission of CaSr2Al2O6:Ce(3+), Li(+), Mn(2+) phosphors can be tuned from blue to red through adjusting the doping concentration of the Mn(2+) ions, under the irradiation of 358 nm. When the concentration of Mn(2+) is increased to 0.02, a warm-white light can be obtained with good CIE coordinates of (0.388, 0.323) and a low CCT of 3284 K. The energy transfer mechanism from the Ce(3+) to Mn(2+) ions is demonstrated to be a quadrupole-quadrupole interaction based on the analysis of the decay curves of the phosphors. The thermal quenching stability was also investigated. The results indicate that CaSr2Al2O6:Ce(3+), Li(+), Mn(2+) samples might have potential applications in w-LEDs.
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: Yurong
authors: Y
authors: Shi
authors: Ge
authors: G
authors: Zhu
authors: Quansheng
authors: Q
authors: Wu
authors: Hao
authors: H
authors: Li
authors: Xicheng
authors: X
authors: Wang
authors: Qian
authors: Q
authors: Wang
authors: Yuhua
authors: Y
authors: Wang