Blue-light-excitable pure and efficient short-wave infrared luminescenceviaCr³⁺→ Yb³⁺energy transfer in a KYbP₂O₇:Cr³⁺phosphor

Abstract

Short-wave infrared (SWIR) light sources featuring large spectral bandwidth and high luminescence efficiency have found wide applications in the fields of night vision, non-destructive detection, covert information identification, and biomedical...

Valence state control of Cr4+-activated Li2SrGeO4for NIR-II light source to distinguish deuterium and non-deuterium reagents

“…On the other hand, colored ink without black carbon has no absorption for NIR-II light, which causes the light to penetrate directly through it and the image has the same gray value as the background. 49,50 Fig. 5e exhibits the human fingers in the white light and the NIR pc-LED light.…”

Enhancing the inherent NIR photoluminescence in SrLaLiTeO6 through Cr3+–Yb3+ co-substitution for high performance pc-LEDs

“…2 F 5/2 → 2 F 7/2 emission transitions of Yb 3+ serve as an effective means to circumvent nonradiative transitions between different energy levels, consequently enhancing the thermal stability of the phosphors. [22][23][24][25][26][27][28][29] Cr 3+ and Yb 3+ co-doped NIR phosphors have been recently studied as spectral converters for solar cell applications since Yb 3+ emission matches well with the spectral response of Sisolar cells. 30 Inspired by this, the combination of Cr 3+ and Yb 3+ has been utilized by many researchers to develop NIR pc-LEDs.…”

“…26 The phosphor shows an emission spanning from 700 to 1200 nm. Some other examples using Cr 3+ [22][23][24]27,29 The pursuit of developing broadband-emitting NIR phosphors underscores the importance of exploring new materials in this field. Double perovskites are known for their various physical properties resulting from their unique crystal structure with distinct sites that can accommodate almost all the elements in the periodic table.…”

Enabling Yb3+ Luminescence with Visible Light Response in Mg2GeO4 via Energy Transfer

“…Extending the absorption range of Yb 3+ -doped materials to the visible region is highly desirable because many applications require the involvement of visible light. For instance, in the case of Yb 3+ -doped phosphor converted LEDs (pc-LEDs), the excitation needs to match commercial blue LEDs for night vision lighting. , In solar cell applications, it is necessary to convert photons in the high-energy visible region to the low-energy NIR region since the spectral response of Si solar cells is strongest in the range of 900–1100 nm. , An effective strategy to enable Yb 3+ luminescence with a visible light response involves codoping other sensitizers such as Ce 3+ , Tb 3+ , Tm 3+ , Pr 3+ , Mn 4+ , and Cr 3+ . By utilization of the energy transfer (ET) process between the sensitizer and Yb 3+ , visible light excitation can be achieved through down-conversion or down-shifting mechanisms.…”

“…For instance, in the case of Yb 3+ -doped phosphor converted LEDs (pc-LEDs), the excitation needs to match commercial blue LEDs for night vision lighting. 10,11 In solar cell applications, it is necessary to convert photons in the high-energy visible region to the lowenergy NIR region since the spectral response of Si solar cells is strongest in the range of 900−1100 nm. 2,12 An effective strategy to enable Yb 3+ luminescence with a visible light response involves codoping other sensitizers such as Ce 3+ , 13 Tb 3+ , 14 Tm 3+ , 15 Pr 3+ , 16 Mn 4+ , 17 and Cr 3+ .…”