Luminescent properties of UV excitable blue emitting phosphors MSr4(BO3)3:Ce3+ (M = Li and Na)

Green upconversion luminescence in Yb3+/Er3+ co-doped ALn(MoO4)2 (A=Li, Na and K; Ln=La, Gd and Y)

“…The concentration quenching effect is caused by the migration of excitation energy from one activator to another until a quenching site is reached and the energy is lost nonradiatively. The concentration quenching will not occur at low concentration, because the distance between identical Er 3+ ions is so large that the energy migration is hampered [33]. With the increasing of the Er 3+ concentration, the average distance between Er 3+ ions become shorter and the energy transfer become convenient.…”

The effect of electron cloud expansion on the red luminescence of Sr4Al14O25:Mn4+ revealed by calculation of the Racah parameters

“…The white light-emitting diodes (WLEDs) show superiorities in terms of low energy consumption, high luminescence efficiency, eco-friendship without mercury pollution, long duration, unbreakable (in contrast to glass bulbs and tubes) with solid-state encapsulation, and easy transportation and installation over than traditional incandescent and fluorescent lamps, while the red phosphor is essential to obtain warm white light with high color rendering index (CRI) and low color temperature for home lighting [1][2][3][4][5][6]. The phosphor activated by Mn 4+ is a promising candidate for WLEDs application, because the narrow lines of Mn 4+ emission could enhance the luminous efficacy of radiation (LER) and the CRI given in units of lumens per watt of radiometric power (lm/ Wrad) [7].…”

Luminescence properties and crystallographic sites for Eu3+ ions in fluorthalenite Y3Si3O10F

“…There have been extensive studies on in oxide-based phosphors such as phosphates [1][2][3], borates [4][5][6], and silicates [7][8][9][10] doped with rare earth ions. In particular, the silicate-based phosphors have recently attracted much attention because of its excellent thermal and chemical stability, lower cost, and high luminescent efficiency.…”