A new broadband near-infrared emitting Mg₂Al₄Si₅O₁₈:Cr³⁺ phosphor for night-vision imaging

Abstract

Phosphor-converted light-emitting diodes (pc-LEDs) have important applications in security surveillance and food testing, however, developing new broadband near-infrared phosphors remains an important issue. Herein, the high-temperature solid-state reaction method was...

Thermally Stable Red-Emitting Ca18K3Sc(PO4)14:Mn2+ Phosphor and Enhanced Luminescence by Energy Transfer Between Ce3+-Eu2+-Mn2+

“…By calculation with eq , the Δ E values of CKSP:1.0Mn 2+ , CKSP:1.0Mn 2+ , 0.02Eu 2+ , and CKSP:1.0Mn 2+ , 0.02Eu 2+ , 0.40Ce 3+ samples are 0.25, 0.22, and 0.21 eV, respectively, as shown in Figure S9d–f. According to a previous study, the decrease in activated energy will increase the probability of nonradiative transitions . In addition, the luminescence intensity of Eu 2+ and Ce 3+ ions decreases because of the increase in temperature, further reducing the energy transfer efficiency among Ce 3+ -Eu 2+ -Mn 2+ .…”

“…According to a previous study, the decrease in activated energy will increase the probability of nonradiative transitions. 61 In addition, the luminescence intensity of Eu 2+ and Ce 3+ ions decreases because of the increase in temperature, further reducing the energy transfer efficiency among Ce 3+ -Eu 2+ -Mn 2+ . Moreover, multi-ion codoped samples usually have more channels of nonradiative transition.…”

Developing Broadband Cr3+-Substituted Phosphor-Converted Near-Infrared Light Sources

“…Thus, one of the promising solutions is applying Cr 3+ -substituted phosphors as more effective NIR light sources. The proposed strategy’s potential has been nicely demonstrated in numerous scientific papers ,,− where researchers show the potential of these systems by taking digital photographs of samples irradiated with a NIR pc-LED and detected using a NIR camera.…”

“…Near-infrared (NIR) spectroscopy in the 700 nm to 1700 nm region of the electromagnetic spectrum has become a research hotspot due to its widespread application in medical diagnostics, night vision, , plant cultivation, , remote sensing, and food freshness analysis. , The historical and universal approach for creating a NIR emission in this window has involved using tungsten lamps that produce a desirable broadband luminescence. However, these sources are extremely energy inefficient, with most energy lost as heat .…”

Broadening of the near-infrared emission band of the Mg2Al4Si5O18:Cr3+ phosphor for illumination emission applications

“…It has been reported that MASO can be used as an excellent matrix for NIR phosphors. 35–37 However, the fluorescence properties of MASO:Cr 3+ in the high and low temperature phases have not been clarified, and the effect of different synthesis temperatures on the properties of phosphors has not been systematically explored.…”