Environment-Dependent Eu²⁺-Activated Ba₃CaK(PO₄)₃ toward White-Light Emission by Chemical Cosubstitution of the (BO₃)^3– Anion Group

Abstract

Investigating the phosphors doped with single activators in a single component to realize white-light emission is urgently desired for phosphor-converted white-light-emitting diodes. In this work, on the basis of the chemical unit cosubstitution strategy, the new borophosphate phosphors Ba 3 CaK(PO 4 ) 3−x (BO 3 ) x :0.02Eu 2+ with a mixed anion group were prepared. Coupling structure refinement and photoluminescence analyses, Ba 3 CaK(PO 4 ) 3−x (BO 3 ) x consists of five different cationic sites with different coordination environments, with Eu 2+ occupying the three sites for Ba 2+ . In the process of partial substituting (BO 3 ) 3− for (PO 4 ) 3− , because of the greatly distorted coordination field generated from the difference in the geometric configurations between the two anion groups, a red shift and broadening of the emission bands occurs, resulting in a coloradjustable emission from blue to white. A phosphor-converted lightemitting diode has been successfully fabricated with the incorporation of an as-prepared Ba 3 CaK(PO 4 ) 2.6 (BO 3 ) 0.4 :0.02Eu 2+ phosphor and a 405 nm near-ultraviolet chip, which exhibits Commission International de I'Eclairage chromaticity coordinates of (0.31, 0.37) and a correlated color temperature of 6295 K. As demonstrated in the present work, an approach adopted from phosphate to borophosphate is conducted to develop high-quality phosphors.

Efficient Solar Spectrum‐Like White‐Light Emission in Zinc‐Based Zero‐Dimensional Hybrid Metal Halides

“…Single-component white phosphors can be divided into inorganics, organics, and inorganic-organic hybrids. Inorganic phosphors achieve white-light emission through double-or triple-metal-ion doping, such as Ba 3 GdK(PO 4 ) 3 F:Tb 3+ /Eu 3+ , [1] BaCKP 3−x B x :0.02Eu 2+ , [2] and Sr 3.5 Y 6.5 O 2 (PO 4 ) 1.5 (SiO 4 ) 4.5 :Ce 3+ /Tb 3+ /Mn 2+ . [3] Inorganic phosphors exhibit high stability but a low CRI.…”

Study on a Highly Thermostable Dy3+-Activated Borophosphate Phosphor

“…The PL spectra of BZBP:0.13Dy 3+ at different temperatures are measured, as shown in Figure a. The PL intensity exhibits a slight decrease as temperature rises, which is related to the thermal quenching effect. − In Figure b, the PL intensities at 423 and 473 K can retain 92 and 88% of the initial value, separately, displaying superior luminescence thermostability compared to that of the Dy 3+ -activated oxide phosphors reported (Table ). Meanwhile, according to the relationship between ln­[( I 0 / I ( T ))–1]­and 1/ kT derived from eq S6, the activation energy barrier ( E a ) is determined to be 0.175 eV (Figure c).…”