Improving the thermal stability and luminescence of Sr3Ga1.98In0.02Ge4O14:0.03Cr3+ through the efficient energy transfer

In this work, in order to explore the near-infrared (NIR) phosphor converted light emitting diodes (pc-LEDs), the NIR phosphor Sr3Ga1.98In0.02Ge4O14:0.03Cr3+, 0.05 Yb3+ was achieved by the high temperature solid-state method, which presents a broadband emission with a large full width at half maximum (FWHM) of 291 nm due to the energy transfer from Cr3+ to Yb3+. The emission intensity (at 423 K) of Sr3Ga1.98In0.02Ge4O14:0.03Cr3+, 0.05 Yb3+ can be maintained at 77 % of room temperature, which is 14 % higher than that before co-doping, indicating that this phosphor has better thermal stability. The NIR pc-LEDs can be fabricated by combining the phosphor Sr3Ga1.98In0.02Ge4O14:0.03Cr3+, 0.05 Yb3+ with the blue LED, which can be applied in night vision. The results demonstrated its potential application value. [Display omitted] •SGIGO:Cr3+, Yb3+ with a FWHM of 291 nm was obtained via Cr - Yb co-doping.•SGIGO:Cr3+, Yb3+ has good temperature stability (77%@423K).•There is an efficient energy transfer in SGIGO:Cr3+, Yb3+ with a value of 88.6 %.