Abstract
• The mechanism of unusual broadens BaMgAl 10 O 17 :Cr 3+ was investigated. • The title phosphor has an excellent internal quantum efficiency (94%). • The title phosphor has good thermal stability (63% at 423 K). • The NIR PiG-LD device applies in mechine vision. Near infrared (NIR) light sources play vital roles in bioimaging, medical treatments, food analysis and machine vision. Herein, we report unusual broadband NIR emission in BaMgAl 10 O 17 :Cr 3+ (BAM:Cr 3+ ) via site engineering. Both the emission maximum and spectral bandwidth of BAM:Cr 3+ can be tailored by controlling the site occupancy of Cr 3+ on two different Al sites. The optimal BAM:0.2Cr 3+ phosphor exhibits both a sharp line spectrum (λ em = 696 nm) and a broadband emission centered at 762 nm, having an internal quantum efficiency (IQE) of ~ 94%. A prototype NIR light source was demonstrated by combining a blue laser diode with BAM:Cr 3+ phosphor-in-glass (PiG) and revealed an NIR light output power of 3.4 mW when driven by a 100 mW blue laser diode.
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