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

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.

A General Ammonium Salt Assisted Synthesis Strategy for Cr3+‐Doped Hexafluorides with Highly Efficient Near Infrared Emissions

“…[ 7–9 ] In contrast, novel NIR phosphor‐converted LED (NIR pc‐LED) with a long lifetime, small size, and low energy consumption, are gaining attention as an ideal NIR lighting source. [ 10–13 ] Moreover, it can be easily integrated into smartphones or wearable devices, thereby facilitating various functional applications. Therefore, the development of a highly efficient broadband NIR emitting phosphor for pc‐LEDs is crucial for both fundamental research and practical applications.…”

Cr3+‐Doped Broadband NIR Garnet Phosphor with Enhanced Luminescence and its Application in NIR Spectroscopy

“…Rajendran et al realized NIR pc‐LED with 18.2 mW@100 mA by using Cr 3+ ‐doped La 3 Ga 5 GeO 14 phosphor . Huang et al reported Cr 3+ ‐doped nano‐ZnGa 2 O 4 broadband NIR phosphor for Mini LEDs . So far, Cr 3+ ‐doped broadband NIR phosphors have attracted increasing interests.…”

Near‐Infrared Nanophosphor Embedded in Mesoporous Silica Nanoparticle with High Light‐Harvesting Efficiency for Dual Photosystem Enhancement

“…A prior study reported that MSNs can load inorganic luminous materials with high biocompatibility owing to their high surface area and mesopore distribution [15] . In the present study, a nanophosphor, namely, ZnGa 2 O 4 :2 %Cr 3+ ,2 %Sn 4+ (ZGOCS), embedded with MSN was synthesized [15, 16] . Its ability to enhance photosynthesis was comprehensively evaluated in Brassica rapa ssp.…”

“…[15] In the present study, a nanophosphor, namely, ZnGa 2 O 4 :2 %Cr 3+ ,2 %Sn 4+ (ZGOCS), embedded with MSN was synthesized. [15,16] Its ability to enhance photosynthesis was comprehensively evaluated in Brassica rapa ssp. chinensis and a mouse model.…”