title: Multicolor Tuning in Room-Temperature Self-Activated Ca2Nb2O7Submicroplates by Lanthanide Doping.
abstract: Self-activated phosphors are capable of generating optical emissions from the internal ion groups of host lattice before externally introducing luminescent ions. However, numerous self-activated phosphors only show luminescence at low temperature due to the thermally activated energy migration among ion groups at room temperature, severely confining their application conditions. In this letter, we propose a strategy to converting the low-temperature luminescence to a room-temperature one through changing the synthesis conditions to induce structural distortions and thus to limit energy migration. Room-temperature self-activated luminescence of Ca2Nb2O7was accordingly achieved in submicroplates synthesized using the sol-gel method. By further coupling the blue broadband emission from Ca2Nb2O7submicroplates with the characteristic luminescence of Ln3+(Pr3+, Sm3+, and Dy3+) dopants, multicolor emissions were successively tuned through adjusting the concentration of Ln3+. Our results are expected to expand the scope of designing room-temperature self-activated phosphors and tuning multicolor emission.
authors.affiliation: College of Physics, Qingdao University, Qingdao, 266071, China.
authors.forename: Jun-Cheng
authors.initials: JC
authors.lastname: Zhang
authors.affiliation: College of Physics, Qingdao University, Qingdao, 266071, China.
authors.forename: Yan-Jie
authors.initials: YJ
authors.lastname: Liu
authors.affiliation: College of Physics, Qingdao University, Qingdao, 266071, China.
authors.forename: Xu
authors.initials: X
authors.lastname: Yan
authors.affiliation: College of Physics, Qingdao University, Qingdao, 266071, China.
authors.forename: Hong-Di
authors.initials: HD
authors.lastname: Zhang
authors.affiliation: College of Physics, Qingdao University, Qingdao, 266071, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Zhang
authors.affiliation: College of Physics, Qingdao University, Qingdao, 266071, China.
authors.forename: Xiaoxiong
authors.initials: X
authors.lastname: Wang
authors.affiliation: College of Physics, Qingdao University, Qingdao, 266071, China.
authors.forename: Wen-Peng
authors.initials: WP
authors.lastname: Han
authors.affiliation: College of Physics, Qingdao University, Qingdao, 266071, China.
authors.forename: Yun-Ze
authors.initials: YZ
authors.lastname: Long
authors.affiliation: Department of Physics, Jinggangshan University, Ji'an, 343009, China.
authors.forename: Xin-Yuan
authors.initials: XY
authors.lastname: Sun
keywords: lanthanides; luminescence; multicolor; room temperature; self-activated