Abstract
Phosphor-converted LEDs (pc-LEDs) emitting in the visible region based on undoped tellurate double perovskites have not been explored till now. A cyan-emitting pc-LED is fabricated using the host Ba2MgTeO6 double perovskite for the first time. The as-fabricated cyan LED emits light in the visible region with the maximum emission at 484 nm. The obtained CIE coordinates of (0.26, 0.37) ensure a cyan light, and LED exhibits superior color stability even at higher input drive current. An attempt to develop a white emitting phosphor was done by substituting Eu3+ ions into the Ba2MgTeO6 matrix. Followed by this, a phosphor converted LED emitting in the bluish white region was fabricated by combining near UV chip and BMTO: 0.02 Eu3+ phosphor. Further, an inherent near-infrared (NIR) luminescence in Ba2MgTeO6 is also discovered and it originates from the 3T1u, 3A1u – 1A1g electronic transitions within the Te4+ ions. Upon 367 nm excitation, Ba2MgTeO6 exhibits strong broadband NIR emission, which spans from 780 nm to 1150 nm with a maximum emission at 889 nm and full width at half maximum (FWHM) of about 115 nm. Finally, an efficient pc-LED emitting in the NIR region is fabricated using the intrinsic near-infrared luminescence observed in the Ba2MgTeO6 phosphor. The pc-LED covering the near infrared region can be potentially used for various applications, including plant cultivation, biosensors, night vision cameras, etc.
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