Facile Synthesis of Highly Efficient and Thermally Stable BaAl₄Sb₂O₁₂:Eu²⁺ Phosphor in Air

Abstract

Despite many Eu2+‐doped phosphors having been synthesized by different methods, a simple synthetic strategy for Eu2+‐doped high‐performance phosphors remains one of the significant challenges for phosphor‐conversion white light‐emitting diodes. Herein, a novel broad‐band excitation yellow phosphor Ba0.985Al4Sb2O12:0.015Eu2+ (BASO:Eu2+) with high thermal stability (423 K, 94%) and internal quantum efficiency (96.7%) are reported. More importantly, the novel phosphor is synthesized by solid‐state reaction at high temperatures in air. Structural and spectral analyses show that the Eu2+ ions in BASO preferably occupy [BaO8] hexahedra, forming a single luminescence center. This study provides a reliable direction for the facile synthesis of high‐performance Eu2+‐doped phosphors in air.

Moderate Trap Engineering for Enhanced Thermal Stability and High Efficiency in a Bi3+-Doped Phosphor

“…The optimal doping concentration of Bi 3+ was determined to be equal to 6%. The critical distance ( R c ) between the nearest Bi 3+ ions in BGA was calculated as 16.71 Å (details in Supporting Information, Notes and Figure S5). , The relation between Ln­( x ) and Ln­( I / x ) is plotted in Figure S4. The value of θ was estimated to be ∼4.2, which is close to 6 .…”

A Novel Cyan Phosphor (K,Rb)3GdSi2O7:Ce3+ for Full‐Spectrum Lighting through Local Structure Tailoring

“…According to the Kubelka‐Munk function and the Tauc plot, the optical band gap of the KGSO host can be determined to be about 5.82 eV. [ 17 ] The large band gap value indicates that KGSO is a suitable matrix for Ce 3+ ‐doped phosphor. KGSO:0.005Ce 3+ exhibits two additional broad absorption bands in the 300−450 nm range, mainly attributed to the transitions of the Ce 3+ ions from the 4f ground state to the 5d excited states (Figure 2a).…”

“…Obviously, the optimal doping concentration was x = 0.005, and concentration quenching occurs when x > 0.005. On the basis of Dexter theory, the multipolar energy transfer mechanism was analyzed in detail: [ 17 ] $$$$\begin{equation} {log\left( {I/x} \right) = logk + \left( {\theta /3} \right)log\left( {1 + \beta \left( x \right)} \right)} \end{equation}$$$$where I and x are the emission intensity and the concentration of Ce 3+ , respectively. k and β refer to the interaction constants in a given host.…”

“…Obviously, the optimal doping concentration was x = 0.005, and concentration quenching occurs when x > 0.005. On the basis of Dexter theory, the multipolar energy transfer mechanism was analyzed in detail: [17] log (I∕x) = logk + (𝜃∕3) log (1 + 𝛽 (x))…”

Energy transfer and tunable emission in BaSrGd4O8:Bi3+,Eu3+ phosphors for warm WLED

“…This is another highly feasible and technologically promising approach. [9][10][11][12] Energy transfer is an effective means of tightly combining multiple phosphors in the same host, particularly for broadening the excitation and emission bands. 13 In contrast to com-monly used activators, such as Ce 3+ and Eu 2+ , trivalent bismuth ions (Bi 3+ ) are also recognized as key elements with exceptional optical properties.…”