2D layered nanomaterials as photocatalysts have attracted much attention in the field of solar hydrogen production due to their unique electronic structure and abundant active sites. Nevertheless, the rational design and interfacial regulation of 2D Z‐scheme heterojunction are still challenging. Herein, an ultrathin 2D ZnIn2S4/g‐C3N4 Z‐scheme heterojunction is precisely constructed via in‐situ growth of ZnIn2S4 on the g‐C3N4. By carefully regulating the interface structure in heterojunction, the hydrogen evolution performance can be greatly improved. The optimized photocatalyst exhibits a remarkable photocatalytic activity without Pt as cocatalyst, which is primarily ascribed to the synergistic effect of abundant active sites, enhanced photoresponse, and valid interfacial charge transfer channels. Meanwhile, the spectroscopic analyses and density functional theory (DFT) calculation results comprehensively prove that the promoted interfacial charge separation in 2D Z‐scheme heterojunction is another key factor for the enhanced photocatalytic performance. This work offers a new avenue for the rational design of ultrathin Z‐scheme heterojunction photocatalysts with improved photocatalytic performance through interfacial engineering.

White or tunable photoluminescence of phosphors is of great significance for their practical applications in the light-emitting diodes. In this work, Ba 2 Y(BO 3 ) 2 Cl:Bi 3+ ,Eu 3+ phosphors were fabricated, and their photoluminescence properties were investigated. Three difference luminescence peaks located at 366, 410, and 490 nm were observed in the single Bi 3+ -doped Ba 2 Y(BO 3 ) 2 Cl phosphor under the excitation of ultraviolet light attributed to three various Bi 3+ sites occupied in the Ba 2 Y(BO 3 ) 2 Cl host. By tuning the excitation wavelength from three various Bi 3+ sites, the tunable luminescence properties were obtained. The energy transfer from Bi 3+ at various sites to Eu 3+ were observed in the Ba 2 Y(BO 3 ) 2 Cl:Bi 3+ ,Eu 3+ phosphors by an electric dipole−dipole interaction. The tunable and white luminescence was obtained by changing the Eu 3+ concentration or excitation wavelength. The light-emitting diodes with the white light emission were constructed by coupling Bi 3+ and Eu 3+ codoped Ba 2 Y(BO 3 ) 2 Cl phosphors with the UV chip, which indicated that the Bi 3+ and Eu 3+ codoped Ba 2 Y(BO 3 ) 2 Cl phosphors can act as a promising candidate for the UV converted WLEDs.

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This study proposes a strategy based on heterovalent ion doping that gives rise to a synergistic piezo-phototronic effect with significantly improved catalytic activity and leads to selective catalytic enhancement for specific pollutants. Owing to the enhanced light absorption, hydrogen evolution rates are as high as 3704 and 3178 µmolg −1 h −1 in 0.01Li-doped BaTiO 3 and 0.02La-doped BaTiO 3 nanosheets, respectively, under simultaneous irradiation by ultrasound and light, a factor of 4.6 and 3.9 times higher than for pure BaTiO 3 . The performance also far exceeds that of single piezocatalysis, photocatalysis, or the sum of the two for Li/La-doped BaTiO 3 nanosheets due to the effects of the piezoelectric field in promoting photo-induced separation of electron-hole pairs. Further, by carefully selecting donor or acceptor doping, a significant enhancement in catalyst to specific pollutants is obtained by controlling the band structure. Compared to pure BaTiO 3 , 0.01Li-doped BaTiO 3 possesses higher catalytic activity for anionic dyes such as Methyl blue and Malachite Green, reaching 0.067 and 1.379 min −1 , respectively, while 0.02La-doped BaTiO 3 exhibits better catalytic performance for cationic dyes such as Rhodamine B and Methyl Orange, with degradation rates up to 0.274 and 0.029 min −1 , respectively. This study offers a path to the design of efficient piezocatalysts for specific applications.