Realizing cool and warm white-LEDs based on color controllable (Sr,Ba)₂Al₃O₆F:Eu²⁺ phosphors obtained via a microwave-assisted diffusion method

Abstract

A broadband emitting Sr1.75Ba0.2Al3O6F: 0.05Eu2+ phosphor emitting cool white light under NUV (Fig. a(i)) and blue LEDs (Fig. b(i)). With a preferred red phosphor, this system produced natural white light with a higher CRI (Fig. a(ii) & b(ii).

Ln2Te6O15 (Ln = La, Gd, and Eu) “Anti-Glass” Phase-Assisted Lanthanum-Tellurite Transparent Glass–Ceramics: Eu3+ Emission and Local Site Symmetry Analysis

“…To evaluate the activation energy for thermal quenching of PL, we used the following Arrhenius equation. , where I 0 and I T are the intensities at room temperature and at temperature T K, respectively, c is a host lattice constant, k is the Boltzmann constant (8.617 × 10 –5 eV K –1 ), and Δ E a is the activation energy for thermal quenching. Equation can be rewritten as …”

“…To evaluate the activation energy for thermal quenching of PL, we used the following Arrhenius equation. 65,66…”

Governing the crystallographic sites for tuning Eu2+ emission in an apatite oxyfluoride host to be applied for superior white light emitting diodes

“…11 Most importantly, the presence of fluorine ions introduces robust electronegativity, which can generate flexible emissive properties. 12 For the recently reported oxyfluorides, the presence of multiple crystallographic sites was able to provide versatile cationic environments for Ce 3+ or Eu 2+ ions, which are effective in generating broad emissions from these ions. 13 Eventually, an appropriate cationic replacement can drive the luminescent centers to produce emission wavelength shifts very effectively.…”

Breaking Through the Luminescence Stability Bottleneck of Oxyfluoride Phosphor for Sun‐Like Led Lighting

“…Oxyfluoride phosphors constitute a significant subgroup within the broader family of phosphors, primarily distinguished by their comparatively lower synthesis temperatures, elevated quantum efficiency, and extensive tunable photoluminescence (PL) properties spanning a wide spectral range. [13][14][15] Among oxyfluorides, Sr 3 AlO 4 F has emerged as a promising host material and garnered extensive research attention. Wang's research team has reported a solid-solution phosphor, Sr3 -x Gd x AlO 4+x F 1-x , exhibiting applications in optical thermometry, [16] while S. Sreevalsa's group explored its potential in flexible displays.…”