Enabling Visualized Time‐Resolved Dynamic Discoloring Afterglow from Carbon Dots by Engineering Luminescent Centers and Trap‐States for Security Applications DOI
Yixuan Xu, Zi‐Han Cheng,

Henggang Wang

et al.

Advanced Optical Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 18, 2024

Abstract Luminescent materials with time‐resolved dynamic discoloring afterglow (TDDA) hold significant potential for applications in anti‐counterfeiting and data encryption. However, the afterglows coming from organic systems are usually unidentifiable due to their shorter durations (less than 10 s). Achievement of long‐lasting visually discernible TDDA remains highly desirable but challenging. In this work, duration is successfully extended less s minutes by engineering luminescent centers carbon dots (CDs) introducing deep trap‐states a composite CDs nitrides (CNs) (named Y‐CDs@CN). It confirmed that regulation containing both C═N C═O bonds responsible color changes during yellow green. Moreover, generation trap states found be prolonging level through converting room temperature phosphorescence into long persistent luminescence, thus making entire process being easily recognized naked eyes. Furthermore, Y‐CDs@CN can also excited blue light even using white cell phone. To harness these characteristics, portable multidimensional information encryption primarily investigated.

Language: Английский

Cascade energy transfer endows phosphorescent carbon dots-based films with tunable and broadband afterglow for fingerprint recognition and anticounterfeiting DOI

Zhanpeng Liu,

Xinyi Ding, Lin Cai

et al.

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 160311 - 160311

Published: Feb. 1, 2025

Language: Английский

Citations

1
Time-Dependent Room-Temperature Afterglow of Carbon Dots Constructed by Trap-Induced Multiemission Centers DOI
Zhun Ran, Hongjie Jia, Ziting Zhong

et al.

Nano Letters, Journal Year: 2025, Volume and Issue: unknown

Published: April 18, 2025

Traps, due to the ability capture, store, and release charge carriers, have attracted significant attention in construction of long afterglow materials. In this study, a one-step situ calcination strategy was employed fabricate carbon dot (CD)-based composites, traps were designed as one emission centers within composite system. Upon removal ultraviolet light, materials showed time-dependent color (TDAC), with luminescent gradually changing from orange green. The study indicates that dynamic results energy transfer surface triplet state CDs. addition, CDs generated during process serve dopants, increasing number original facilitating formation new ones. Based on TDAC characteristics, we demonstrate applications anti-counterfeiting information encryption. This offers insights into development multicolor

Language: Английский

Citations

0
Enabling Visualized Time‐Resolved Dynamic Discoloring Afterglow from Carbon Dots by Engineering Luminescent Centers and Trap‐States for Security Applications DOI
Yixuan Xu, Zi‐Han Cheng,

Henggang Wang

et al.

Advanced Optical Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 18, 2024

Abstract Luminescent materials with time‐resolved dynamic discoloring afterglow (TDDA) hold significant potential for applications in anti‐counterfeiting and data encryption. However, the afterglows coming from organic systems are usually unidentifiable due to their shorter durations (less than 10 s). Achievement of long‐lasting visually discernible TDDA remains highly desirable but challenging. In this work, duration is successfully extended less s minutes by engineering luminescent centers carbon dots (CDs) introducing deep trap‐states a composite CDs nitrides (CNs) (named Y‐CDs@CN). It confirmed that regulation containing both C═N C═O bonds responsible color changes during yellow green. Moreover, generation trap states found be prolonging level through converting room temperature phosphorescence into long persistent luminescence, thus making entire process being easily recognized naked eyes. Furthermore, Y‐CDs@CN can also excited blue light even using white cell phone. To harness these characteristics, portable multidimensional information encryption primarily investigated.

Language: Английский

Citations

2