Broadband Cr3+, Sn4+‐Doped Oxide Nanophosphors for Infrared Mini Light‐Emitting Diodes

Nanophosphors on display: Mesoporous silica nanoparticles were used as nanocarriers to form the nanophosphor ZnGa₂O₄:Cr³⁺,Sn⁴⁺ (ZGOCS) in the mesoporous structure after sintering. Good dispersity and morphology can be observed. Good packing density and light conversion efficiency were achieved for a mini‐light emitting diode.

Abstract

Light‐emitting diodes break barriers of size and performance for displays. With devices becoming smaller, the materials also need to get smaller. Chromium(III)‐doped oxide phosphors, which emit near‐infrared (NIR) light, have recently been used in small electronic devices. In this work, mesoporous silica nanoparticles were used as nanocarriers. The nanophosphor ZnGa₂O₄:Cr³⁺,Sn⁴⁺ formed in the mesopore after sintering. Good dispersity and morphology were performed with average diameters of 71±7 nm. It emitted light at 600–850 nm; the intensity was optimized by tuning the doping ratio of Cr³⁺ and Sn⁴⁺. Meanwhile, the light conversion efficiency increased from 7.8 % to 37 % and the molar concentration increased from 0.125 m to 0.5 m. The higher radiant flux of 3.3 mW was obtained by operating an input current of 45 mA. However, the NIR nanophosphor showed good performance on mini light‐emitting diode chips.

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