Long Persistent Phosphor CdSiO₃:Gd³⁺,Bi³⁺ and Potential Photocatalytic Application of CdSiO₃:Gd³⁺,Bi³⁺@TiO₂ in Dark

Abstract

To support photocatalytic decomposition of TiO 2 in lowtransparent wastewaters or in the dark, we develop a novel ultraviolet emitting long persistent phosphor CdSiO 3 :Gd 3+ , Bi 3+ , which the persistent luminescence can last for more than 6 h (0.32 mcd/m 2 ). Approximately 68.7% of the spectral areas of the optimal sample can well match the absorption band of TiO 2 . The long persistent luminescent mechanism is discussed in details. The investigations of decomposition of methylene blue by CdSiO 3 :Gd 3+ ,Bi 3+ @TiO 2 composite reveals that the long persistent luminescence of CdSiO 3 :Gd 3+ ,Bi 3+ can not only support the photocatalytic activity of TiO 2 in the dark but also significantly increases the photocatalytic efficiency under ultraviolet irradiation. Thus, the CdSiO 3 :Gd 3+ , Bi 3+ @TiO 2 composite is potentially used as functional photocatalyst to treat the organic pollutants in low-transparent wastewater or in the dark.

Recent advances and prospects of persistent luminescent materials as inner secondary self-luminous light source for photocatalytic applications

“…In RE-doped MPLs, the persistent luminescence mainly originates either from d-f transition RE ions (i.e., Eu 2+ , and Ce 3+ ) [31, 33-34, 42, 44, 49, 57, 60-106], well-shielded 4f (e.g., Eu 3+ , Pr 3+ , Tb 3+ , Sm 3+ , Tm 3+ , Gd 3+ , and Dy 3+ ) [35-37, 51-52, 107-142], or from the coupling arrangements of these RE ions [33-34, 38, 42, 44, 52, 57, 64, 67-69, 72-77, 79-82, 85-89, 92-94, 96-99, 101, 103, 105-107, 118, 120, 125, 127, 134]. Besides, with the purposes of creating the defects, modifying the trap depths, or constructing the energy transfer paths, the non-RE (e.g., Bi 3+ [91,130,141], Mn 2+ [90,92], Cr 3+ [40,56,84,87]), or some of other RE (e.g., Nd 3+ [49,61,[70][71]142], Pr 3+ [38,56,98,101,107], Ho 3+ [95,125] etc) are also often used as the co-dopants for RE-doped MPLs.…”

Super‐Long Persistent Luminescence in the Ultraviolet A Region from a Bi3+‐Doped LiYGeO4 Phosphor

“…In addition, long‐term sterilization and bacteriostasis can be achieved by using UVA PerL to excite photosensitizers that can generate free radicals . In addition, UVA PerL materials can also be used as a continuous excitation source to drive the photocatalytic reactions of C 3 N 4 , Ag 3 PO 4 , or TiO 2 in the dark, providing a good solution for energy savings . However, the development of UVA PerL materials still has many shortcomings regarding PerL intensity, spectral region or PerL time, which are unsatisfactory for future applications.…”

Fingerprint Acquisition Based on Photo‐Thermal Coloration of MoO3 Ceramic upon the Irradiation of Multiband Light outside the Bandgap

“…Therefore, in order to avoid the limitations of organic photochromic materials, the inorganic photochromic materials are getting more attention with their excellent thermal stability, fatigue resistance, and oxidation resistance. [ 20–23 ] At present, the photochromic properties of Na 0.5 Bi 2.5 Nd 2 O 9 , WO 3 , MoO 3 , TiO 2 , Sr 2 SnO 4 , BaMgSiO 4 , Na 0.5 Bi 4.5 Ti 4 O 15 materials were extensively reported upon the light irradiation inside the bandgap, and these photochromic materials were well used in the optical switch and anti‐counterfeiting, etc. [ 13,24–26 ] However, the fingerprint acquisition based on the photochromism reaction has never been investigated.…”