Self‐activated persistent luminescence from Ba₂Zr₂Si₃O₁₂for information storage

Abstract

Till now, many doped persistent luminescence (PersL) phosphors have been investigated and found various applications in such as bioimaging, photocatalysis and information storage, but introducing PersL emitters into a proper host is mostly complex. In this research, a self-activated PersL phosphor Ba 2 Zr 2 Si 3 O 12 (BZSO) is prepared by solid state reaction. By adding NH 4 Cl, the self-activated PersL intensity is evidently enhanced. The trap depths and concentrations are examined by thermoluminescence spectra. Meanwhile, Bi 3+ ions are introduced into BZSO and show wide band photoluminescence (PL) from 300 to 600 nm. Moreover, the PL of Bi 3+ is tunable under excitation by 265-350 nm lights. Furthermore, as a proof-of-concept design, we designed a patterned quick response (QR) code based on the self-activated PersL of BZSO, and the information of "South China University of Technology (SCUT)" can be read out by the code scanning technology. Bi 3+-doped BZSO phosphors are suggested to provide potential applications in information storage by its self-activated PersL, and to excite researchers to study the tunable PL in Bi 3+-doped phosphor.

Ultra‐broadband and thermally stable NIR emission in Bi‐doped glasses and fibers enabled by a metal reduction strategy

“…First, when no Al powder is introduced in the glass sample, the glass network structure is mainly composed of six‐GeO 4 ‐membered rings and four‐GeO 4 ‐membered rings, and the NIR luminescence of the sample is relatively weak due to trace amounts of low‐valent Bi NIR active centers (Figure 5A(i)). The obvious broadband blue emission located at ∼440 nm (Figure 5B), which is the typical luminescence of Bi 3+ , is observed in the 0Al sample 43 . Whereafter, an appropriate amount of Al powder was added to such germanate glass, and the NIR luminescence of samples can greatly be enhanced, including the intensity and bandwidth (Figure 1).…”

Regulating the Bi NIR luminescence behaviours in fluorine and nitrogen co-doped germanate glasses

“…21 The above two reasons will drive the oxidation of Bi in low valence into higher valence, which are not active NIR centers. [50][51][52] At the same time, the depolymerized glass network will promote the interaction between Bi + and Bi 0 . At a result, the energy transfer between Bi + and Bi 0 is enhanced, this is why we can observe the increased energy transfer efficiency from Bi + to Bi 0 in table 1.…”

Anionic Regulation toward Bi3+ Selective Occupation for Full-Spectrum White Light Emission

“…One of the most significant characteristics to consider when assessing phosphors for white LED applications is thermal stability. − Figure (a) depicts the temperature-dependent emission spectra of NYB 1.5 P 0.5 O:0.005 Bi 3+ at 30–210 °C under 365 nm excitation. Obviously, the emission intensity of NYB 1.5 P 0.5 O:0.005 Bi 3+ decreases gradually with increasing temperature.…”