Ultrawide-band near-infrared light source over 1 mW by Sm³⁺,Pr³⁺-codoped glass phosphor combined with LED

Abstract

We have synthesized 0.3Sm2O3–0.12Pr2O3–10Bi2O3–45Sb2O3–45B2O3 glass as an ultrawide-band near-infrared phosphor for LED-based light sources. We have achieved an ultrawide-band luminescence from 760 to 1100 nm with an output power of over 1 mW by combining a blue LED with Sm3+,Pr3+-codoped borate glass in one package. Absorption bands corresponding to C–H and O–H stretchings in aqueous solutions of glucose have been observed using this light source and a multichannel spectrometer. These results indicate that the Sm3+,Pr3+-codoped borate glass combined with the blue LED is a useful novel light source for absorption spectrometry.

Photoluminescence properties of a ScBO3:Cr3+ phosphor and its applications for broadband near-infrared LEDs

“…Besides white LEDs, the rapid developments of solid state lighting technologies also will provide a promising solution to construct broadband NIR light sources, taking advantage of the phosphor-converted LED technique. [3][4][5][6][7] NIR light sources can be widely applied in a variety of elds, such as optical communication, biomedical imaging, spectroscopy, food detection, security surveillance and face (or iris) recognition. [8][9][10][11][12] Incandescent bulbs, halogen lamps and AlGaAsbased LEDs are normally used as NIR light sources, however, to some extent suffering from various weaknesses.…”

“…The utilization of 4f-4f transitions of trivalent lanthanide ions is hampered by their spectrally narrow and low intensity absorption. 3,4 For divalent or trivalent lanthanide ions (e.g., Eu 2+ and Ce 3+ ) featuring 4f-5d optical transitions, it is difficult to achieve the light emissions in the NIR spectral range due to the large energy separation between 4f and 5d levels. Recently, Bi-doped crystals and glasses have attracted intense attention due to their super broadband emissions from visible to NIR.…”

Heavy Mn2+ Doped MgAl2O4 Phosphor for High‐Efficient Near‐Infrared Light‐Emitting Diode and the Night‐Vision Application

“…Amongst, the (Al,Ga)As‐based NIR LEDs present a narrow full width at half maximum (FWHM, ≈40 nm), and the tungsten lamp shows broad‐band NIR emission, whereas it suffers from short lifetimes, large sizes, and low energy efficiency . By contrast, the supercontinuum solid‐state lasers exhibit excellent spectral features of continuous light emissions and high spectral stability, but the high cost, high electric power consumption, and noncompactness limited their application . For this issue, the NIR pc‐LED fabricated by the blue InGaN chip and broad‐band NIR emitting phosphor can supply the new opportunity, which possess long lifetime, low energy consumption, and low cost .…”

“…By contrast, the supercontinuum solid‐state lasers exhibit excellent spectral features of continuous light emissions and high spectral stability, but the high cost, high electric power consumption, and noncompactness limited their application . For this issue, the NIR pc‐LED fabricated by the blue InGaN chip and broad‐band NIR emitting phosphor can supply the new opportunity, which possess long lifetime, low energy consumption, and low cost . Hence, the discovery of broad‐band NIR emitting phosphor suitable for blue InGaN chip excitation is not only fundamental importance, but also crucial for practical application.…”

“…Trivalent rare earth ions acted as NIR emission centers that have been applied previously, while the intrinsic narrow‐band excitation and emission restricted their NIR pc‐LED applications . In comparing with the f – f transition of rare earth ions, the d – d transition of transition metal ions usually exhibit broad‐band absorption and emission, thus showing more potential in NIR pc‐LEDs .…”