Tuning of the thermal quenching performance of Bi³⁺-doped scheelite Ca(Mo/W)O₄ solid solution phosphors

Abstract

The utilization of phosphor materials has always been a significant barrier in terms of improving thermal quenching performance. In this work, the thermal quenching performance tuning mechanism is proposed, which...

Adjustment of Bi3+ Luminescence and Thermal Quenching Properties by B′-Site Ion Substitution Strategy in Double Perovskite CaLaMgSb/TaO6:Bi3+ Phosphor

“…Therefore, when Δ E is larger, the more energy is required for the electron to complete the leap, which can reduce the quenching process and thus enhance the thermal quenching resistance. This can be calculated by the following Arrhenius formula I ( T ) = I 0 1 + A × exp ( − Δ E / K B T ) where I 0 is the integrated intensity at the incipient temperature, I ( T ) is the integrated intensity at T temperature, and K B and A are constants ( K B = 8.629 × 10 –5 eV·K –1 is the Boltzmann constant). When x = 0–1, the values of Δ E are 0.2658, 0.2655, 0.2738, 0.3120, and 0.3301 eV, respectively (Figure a–e).…”

“…X-ray photoelectron spectroscopy (XPS) was performed on a Thermo Scientific K-Alpha with Al Kα rays (1486.6 eV) as the excitation source. In addition, detailed instrument information and parameters used for XRD testing, Rietveld refinement, UV–visible diffuse reflectance spectroscopy, Raman spectroscopy, excitation and emission spectra, and temperature-dependent spectroscopy could be referred to in the previous work …”

“…In addition, detailed instrument information and parameters used for XRD testing, Rietveld refinement, UV−visible diffuse reflectance spectroscopy, Raman spectroscopy, excitation and emission spectra, and temperature-dependent spectroscopy could be referred to in the previous work. 16…”

“…The usage of phosphor-converted light-emitting diodes (pc-LEDs) in electrical gadgets, security systems, backlit displays, and solid-state lighting has sparked a lot of exploration in recent years. − Yet, one of the key obstacles preventing the widespread usage of phosphors is thermal quenching brought on by nonradiative relaxation. Most of the current studies have focused on developing the thermal quenching resistance of rare earth activated phosphors, but substrates with great thermal stability and superior structural rigidity are still rare, so a series of strategies are urgently needed to improve the luminescence of phosphors at high temperatures. − Combined with previous studies, ion substitution strategy (homo- or heterovalent) in the matrix is an effective strategy, and the radius, charge, and electronegativity of matrix cations significantly influence the luminescence characteristics of activator ions, although previous researchers have used ion substitution to modulate the luminescent thermal quenching properties of some phosphors. − For example, Kim et al constructed Lu 3– x Ca x Al 2–2 x Mg 2 x Al 3–3 x Si 3 x O 12 :Ce 3+ solid solutions with Ba 2+ -substituted Ca 2+ /Mg 2+ sites. The thermal stability was significantly improved (95% of the initial strength at 150 °C).…”

Investigation of multicolor emitting Cs3GdGe3O9:Bi3+,Eu3+phosphorsviaenergy transfer for WLEDs

“…13,14 Due to the susceptibility of the 6s and 6p electrons to the crystal field environment, the emission color of Bi 3+ can cover the whole visible light range from blue to red. [15][16][17] Bi 3+ ions are also commonly used as sensitizers for co-doping with other activator ions (such as Eu 3+ , Tb 3+ and other rare earth ions). As an important rare-earth activator ion, the Eu 3+ ion shows red narrow-band emission due to 5 D 0 → 7 F J ( J = 0-6) transitions.…”