Potential white-light long-lasting phosphor: Dy3+-doped aluminate

Abstract

The white-light long-lasting phosphor CaAl2O4:Dy3+ was prepared and investigated. The white-light afterglow spectra under the irradiation of 254 or 365nm are comprised of the blue light emission and the yellow light emission, originating from the transitions of F9∕24→H15∕26, F9∕24→H13∕26 in the 4f9 configuration of Dy3+. The afterglow can last 32min for the best sample with Dy-doped concentration of 2at.%. The decay curve and the thermoluminescence curve show to be a second-order process. Thermoluminescence curves exhibit a complicated structure in the range of 230–450K with the peaks at 244, 280, 310, and 346K. The two thermoluminescence bands peaking above room temperature have corresponding traps with the depths of 0.54 and 0.61eV, which are responsible for the afterglow emission at room temperature. This work provides a promising approach for the development of white-light long-lasting phosphor.

Emerging cool white light emission from Dy3+ doped single phase alkaline earth niobate phosphors for indoor lighting applications

“…43,44 As shown in Fig. 6(a), the emission intensity increases initially with an increase in concentration of Dy 3+ ions and reaches to a maximum at x = 0.5 mol% and then gradually decreases beyond 0.5 mol% due to the concentration quenching phenomenon.…”

Long lasting phosphorescence in oxygen-deficient zinc–boron-germanosilicate glass–ceramics

“…In recent years extensive research work has been carried out for developing new long lasting phosphorescence (LLP) materials because of their wide use in emergency lighting, safety indication, road signs, and so on [1][2][3][4][5]. Actually, LLP is a so special phenomenon due to the thermal-stimulated recombination of holes and electrons in traps at room temperature that only suitable hosts doped with right activator could yield considerable phosphorescence.…”

A White‐Light‐Emitting Borate‐Based Inorganic–Organic Hybrid Open Framework

“…Thus far, research on SEC intrinsic white-light-emitting phosphors has mainly focused on polymers, such as Si-based materials [8] and polyfluorene derivatives, [9] and inorganic materials doped with rare earth metal ions. [10] In contrast, the field of SEC white-lightemitting borate phosphors remains vacant.…”