Excitation‐Dependent Long Afterglow Room‐Temperature Phosphorescence Material Activated by Doping Boric Acid Matrix

Abstract

Room-temperature phosphorescence (RTP) materials are normally prepared by doping guest materials into space-limited host materials to inhibit nonradiative decay. This work aims to prepare a long afterglow excitation-dependent emission RTP material by doping a small amount of 4-carboxyphenylboronic acid into the boric acid matrix, followed by heat-treating. The calculation of density functional theory shows that the electron cloud distribution and electron transfer trend of the selected material reduces the energy requirement to excite the RTP properties of the obtained materials. The obtained RTP materials can be excited by UV light at 310 and 365 nm for dark blue and green phosphorescence emission, respectively. The results demonstrate the long phosphorescence lifetimes of 1.97 and 0.62 s and the high absolute photoluminescence quantum yields of 17.4% and 15.6%. These results show that the obtained RTP materials have potential prospects as information coding and phosphorescent anti-counterfeiting.

Achieving Efficient Room-Temperature Phosphorescence in the Host–Guest System through Covalent-Bond-Strengthened Hydrogen Bonding

“…As shown in Figure d, heated BA and TDCA@BA showed almost identical behavior in the FTIR spectra. Typically, three obvious peaks at 650, 1190, and 1435 cm –1 were observed, corresponding to the vibration of B–O bonds, B–OH bending, and stretching vibrations of B–O, respectively. ,, Two relatively wide peaks at 1490 and 3216 cm –1 are associated with B–O and −OH stretching vibrations, respectively. After loading TDCA, the peak at 3216 cm –1 became wider, suggesting the formation of hydrogen bonds between TDCA and BA matrix. , This is also consistent with the results of the Raman measurements (Figure S1).…”

Simultaneous NIR photoluminescence and mechanoluminescence from Cr3+ activated MgGa2O4 phosphors with multifunctions for optical sensing

“…Using blue LED chips with Cr 3+ doped near-infrared phosphors can notably boost near-infrared emission efficiency. 21–23…”

Photo- and Oxygen- Synergistically Controlled Selective Expression of Organic Phosphorescence Units

“…PMMA and PVA are frequently used as polymer hosts as they can provide a rigid environment to significantly inhibit nonirradiative relaxation of triplet excitons. − Compared with the host, the guest library expands more discretely. Till date, derivatives of 1 H -benzo­[f]­indole (Bd), , 7 H -Benzo­[c]­carbazole (BCz), 5 H -Benzo­[c]­carbazole (BCz-1), , N -phenyl-1-naphthylamine ( N -1), N -phenyl-2-naphthylamine ( N -2), phenylboronic acid, − and so forth have been reported as excellent guests. It is worth mentioning that some guests (such as Bd, BCz, BCz-1, etc.)…”