Broadband emitting phosphor Sr₆Sc₂Al₄O₁₅:Cr³⁺ for near-infrared LEDs

Abstract

Near-infrared (NIR) phosphors play a key role in phosphor-converted NIR emitters, but to find broadband phosphors still remains a great challenge due to the lack of strategies for screening appropriate...

A highly thermally stable Y3AlGa4O12:Cr3+ phosphor for near-infrared pc-LEDs

“…The crystallographic and refinement parameters are listed in Table 1. The lattice parameters ( a = b = c = 12.22 Å, V = 1825.83 Å 3 ) of YAGG:0.1Cr 3+ show an obvious increase compared with that of YAG ( a = b = c = 12.00 Å, V = 1728.13 Å 3 ) 15 because the ionic radii of Ga 3+ ( r = 0.62, CN = 6) is larger than that of Al 3+ ( r = 0.54, CN = 6). The crystal structure of YAGG:Cr 3+ is shown in Fig.…”

Realization of Broadband Near-Infrared Emission with High Thermal Stability in YGa3(BO3)4: Cr3+ Borate Phosphor

“…The red shift may be attributed to the decrease in the crystal field strength and the reabsorption of Cr 3+ . 41 The decay lifetime (Figure 3c) of YGBO: xCr 3+ phosphors (monitoring the 760 nm emission peak) conform to a single exponential function (eq S2), indicating that there is only one type of luminescence center in the YGBO: xCr 3+ phosphors, which further verifies the previous analysis and prediction for the lattice occupancy of Cr 3+ ions. As the concentration of Cr 3+ increases, the luminescence decay lifetime decreases from 47.22 to 44.41 μs (Table S3).…”

“…As is well known, Ga 3+ (0.62 Å) and Cr 3+ (0.615 Å) have similar ionic radii in the octahedral environment, so Cr 3+ doping should have little effect on the crystal structure distortion of the YGBO host. The red shift may be attributed to the decrease in the crystal field strength and the reabsorption of Cr 3+ …”

Efficient and stable near-infrared Y2Mg2Al2Si2O12:Cr3+ phosphor: analysis of the luminescence source by a site elimination strategy

“…As an integral part of the electromagnetic spectrum, broadband NIR light plays an unprecedentedly important role in biological detection, laboratory instrumentation, chemical industry, optoelectronic devices, and medical diagnostics. 1–6 In particular, NIR light in the 700–1100 nm region is known as the first biological window, which can be used in bio-imaging and non-destructive testing due to its considerable penetration depth in biological tissues besides plant growth and night vision application. 7–9 Traditional NIR light sources such as incandescent lamps and halogen lamps have a series of problems like large size, low output, and high energy consumption, which hinder the further development of portable and integrated NIR technology.…”