Customized Cyan Phosphors for Efficient Full-Spectrum Illumination and Fingerprint Detection

Area of Science:

• Materials Science
• Solid-State Chemistry
• Photoluminescence

Background:

• Traditional lighting technologies face environmental and efficiency challenges.
• Light-emitting diodes (LEDs) offer superior color rendering and energy efficiency.
• Developing advanced phosphors is key to enhancing LED performance.

Purpose of the Study:

• To design color-tunable phosphors for improved white LED applications.
• To investigate the effect of cation substitution on phosphor properties.
• To evaluate the potential of novel phosphors in high-fidelity lighting and identification.

Main Methods:

• Synthesis of solid-solution NaBa2(Ba/Sr/Ca)Si2O7F:Eu2+ phosphors.
• Structural analysis using X-ray diffraction.
• Photoluminescence spectroscopy and fluorescence lifetime measurements.
• Evaluation of internal quantum efficiency and thermal quenching.

Main Results:

• Successful synthesis of high-quality solid-solution cyan phosphors.
• Achieved remarkable internal quantum efficiency (IQE = 93%) for cyan emission.
• Demonstrated low thermal quenching (I423 K/I303 K = 84%).
• Fabricated white LEDs (WLEDs) with high color rendering (Ra = 96.8).

Conclusions:

• Eu2+-activated cyan phosphors are crucial for achieving natural white light spectra.
• These phosphors significantly reduce the spectral gap for high color fidelity.
• The developed phosphors show practical utility in high-performance WLEDs and fingerprint detection.