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Suppressing Defect Formation via Li2CO3-Assisted Synthesis Strategy: Toward High-Performance Al5BO9:Cr3+
Yongying Chen1, Mingkai Wei1, Xiaoyu Shuang1
1Key Laboratory for Biobased Materials and Energy of Ministry of Education, College of Materials and Chemical Engineering, South China Agricultural University, Guangzhou510642, China.
Inorganic Chemistry
|August 10, 2026
Summary
A new Li2CO3-assisted method improves near-infrared phosphor-converted light-emitting diodes (NIR pc-LEDs) by enhancing crystallinity and preventing Cr3+ oxidation. This boosts efficiency and thermal stability for better plant growth lighting.
Area of Science:
- Materials Science
- Solid-state Chemistry
- Optoelectronics
Background:
- Near-infrared phosphor-converted light-emitting diodes (NIR pc-LEDs) performance is limited by phosphor defects formed during high-temperature synthesis.
- These defects reduce luminous efficiency and thermal stability, hindering practical applications.
Purpose of the Study:
- To develop a novel synthesis strategy for high-performance Cr3+-doped Al5BO9 phosphors for NIR pc-LEDs.
- To enhance the crystallinity and mitigate Cr3+ oxidation in Al5BO9:Cr3+ phosphors.
- To improve the luminous efficiency and thermal stability of NIR phosphors.
Main Methods:
- A Li2CO3-assisted solid-state reaction strategy was employed for synthesizing Al5BO9:Cr3+ phosphors.
- The decomposition properties of Li2CO3 at high temperatures were utilized to promote grain growth and stabilize Cr3+.
- Characterization of phosphor properties including emission spectra, quantum efficiency, and thermal stability.
Main Results:
- The optimized Al5BO9:Cr3+ phosphor exhibited broadband NIR emission (650-900 nm) with a significantly increased internal quantum efficiency from 55.4% to 80.5%.
- Luminescence intensity retention at 423 K improved from 75.3% to 81.9%, indicating enhanced thermal stability.
- A prototype NIR pc-LED achieved an output power of 59.4 mW and a photoconversion efficiency of 21%.
Conclusions:
- The Li2CO3-assisted solid-state strategy is a practical and effective method for preparing high-performance Cr3+-doped NIR phosphors under ambient atmosphere.
- The developed NIR pc-LEDs show potential for applications in plant cultivation, significantly promoting growth.
- This approach offers a pathway to overcome limitations in current NIR pc-LED technology.
