Efficient Broadband Near-Infrared CaMgGe₂O₆:Cr³⁺ Phosphor for pc-LED

Area of Science:

• Materials Science
• Optoelectronics
• Spectroscopy

Background:

• Broadband near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs) are crucial for mobile NIR spectrometers.
• A significant gap exists in efficient NIR phosphors emitting above 800 nm.

Purpose of the Study:

• To develop a novel broadband NIR phosphor for advanced spectroscopic applications.
• To enhance the capabilities of mobile devices for biological component detection.

Main Methods:

• Synthesized CaMgGe2O6:Cr3+ phosphor using a high-temperature solid-state reaction.
• Fabricated a broadband NIR pc-LED using the synthesized phosphor and a blue LED chip.

Main Results:

• The CaMgGe2O6:0.02Cr3+ phosphor exhibited an 845 nm emission band with 160 nm bandwidth and 84% quantum yield.
• Achieved record photoelectric efficiency (27.2% @ 10 mA) and NIR output power (57.98 mW @ 100 mA) for NIR pc-LEDs (>800 nm).
• Demonstrated successful acquisition of substance absorption spectra using the fabricated NIR pc-LED.

Conclusions:

• The CaMgGe2O6:Cr3+ phosphor shows significant potential for NIR spectroscopic applications.
• The developed NIR pc-LEDs represent a substantial advancement for mobile spectroscopic devices.
• This research addresses the deficiency in efficient broadband NIR phosphors for practical applications.