A broadband near-infrared Cr³⁺-doped phosphor applied to near-infrared light-emitting diodes: enhanced luminescence and thermal stability by annealing

Abstract

Cr3+-activated phosphors with high quantum efficiency show excellent promise in the field of near-infrared (NIR) phosphor converted light-emitting diode (pc-LED). Here, we design an annealing program for Cr3+-doped phosphors containing...

Broadband short-wave near-infrared-emitting phosphor MgNb2O6:Cr3+ for pc-LED applications

“…To comprehensively understand the thermal quenching behavior of MgNb 2 O 6 :Cr 3+ , the activation energy (Δ E ) was calculated by means of the Arrhenius equation, 25,52–54 where I 0 is the initial PL intensity of the luminescent materials at room temperature, I T is the PL intensity of a given absolute temperature T , K is the Boltzmann constant, and A is a constant. The thermal disturbance energy Δ E swas calculated to be 0.473 eV by the typical Arrhenius fitting shown in Fig.…”

“…Because the working LED chip, especially at high driven currents, will inevitably produce a huge amount of heat, reaching at least 100–150 °C, 52 tolerant thermal stability of luminescence properties of the phosphor candidates is necessary. Therefore, it is of great interest to investigate and to enhance the thermal response of the MgNb 2 O 6 :Cr 3+ broadband NIR luminescence for practical pc -LED applications.…”

“…To comprehensively understand the thermal quenching behavior of MgNb 2 O 6 :Cr 3+ , the activation energy (ΔE) was calculated by means of the Arrhenius equation, 25,[52][53][54]…”

An efficient and thermally stable Cr3+-activated Y2GdSc2Al2GaO12 garnet phosphor for NIR spectroscopy applications

“…35 Furthermore, the EDS element mapping images of the YGSAG: 0.08Cr 3+ sample indicate that the Y, Gd, Sc, Al, Ga, O and Cr elements are uniformly distributed in the particles without charge accumulation. 36…”

Origin of the Cr3+ concentration-dependent broadband near-infrared emission in Sc2Si2O7

“…This technology has the advantages of being small in size and having low power consumption, making it particularly useful in the fields of food analysis and medical treatment. [1][2][3] As the performance of pc-LEDs is primarily determined by the NIR emitting phosphors, enormous efforts have been made to seek broadband and efficient NIR luminescent materials. Compared to other NIR-emitting materials, Cr 3+ -activated materials have gained significant attention due to their high quantum efficiency, tunable broadband emission and strong absorption in the blue spectral range.…”