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Superior Multimodal Luminescence in a Stable Single-Host Nanomaterial with Large-Scale Synthesis for High-Level
Bingyin Kong1, Gencai Pan1, Mengke Wang1
1Key Laboratory for High Efficiency Energy Conversion Science and Technology of Henan Province, International Joint Research Laboratory of New Energy Materials and Devices of Henan Province, School of Physics and Electronics, Henan University, Kaifeng, 475004, P. R. China.
Researchers developed stable, multimodal luminescent nanocrystals for advanced anti-counterfeiting. These materials exhibit tunable emissions under various stimuli, offering high security for encryption and authentication applications.
Area of Science:
- Materials Science
- Nanotechnology
- Photonics
Background:
- Multimode luminescent materials offer high encoding capacity for anti-counterfeiting and encryption.
- Integrating multiple luminescence modes into a single, stable material is a significant challenge.
Purpose of the Study:
- To develop a single, stable nanomaterial exhibiting diverse luminescent properties.
- To explore novel routes for advanced anti-counterfeiting and encryption technologies.
Main Methods:
- Synthesized Er3+ doped Cs2NaYbCl6 nanocrystals (NCs).
- Investigated downshifting/upconversion emissions, persistent luminescence (PersL), temperature-dependent, and hydrochromic luminescence.
- Utilized shallow defect levels and directed energy migration for multimodal luminescence.
- Performed theoretical calculations and experimental characterizations.
Main Results:
- Achieved integrated downshifting/upconversion, tunable PersL, temperature-dependent, and hydrochromic luminescence in a single NC system.
- Demonstrated stable and dynamic colorful luminescence under UV, 980-nm laser, and X-ray excitation.
- Observed reversible emission modal and color changes in response to water.
- Exhibited remarkable environmental stability with over 18 months of air storage.
Conclusions:
- The developed Er3+ doped Cs2NaYbCl6 NCs provide a novel platform for multimodal luminescence.
- Self-trapped exciton states, chlorine vacancy defects, and Er3+ energy levels are key to multimodal emission.
- These stable, multimodal luminescent nanomaterials show significant potential for anti-counterfeiting and encryption applications.
