Perovskite-type oxynitrides hold great potential for optical applications due to their excellent visible light absorption properties. However, only a limited number of such oxynitrides with modulated physical properties are available to date and therefore alternative fabrication strategies are needed to be developed. Here, we introduce such an alternative strategy involving a precursor microstructure controlled ammonolysis. This leads to the perovskite family member LaTa(IV)O₂N containing unusual Ta⁴⁺ cations. The adjusted precursor microstructures as well as the ammonia concentration are the key parameters to precisely control the oxidation state and O:N ratio in LaTa(O,N)₃. LaTa(IV)O₂N has a bright red colour, an optical bandgap of 1.9 eV and a low (optically active) defect concentration. These unique characteristics make this material suitable for visible light-driven applications and the identified key parameters will set the terms for the targeted development of further promising perovskite family members.

钙钛矿型氧氮化物由于其出色的可见光吸收性能而在光学应用中具有巨大的潜力。然而，迄今为止仅有有限数量的具有调节的物理性质的这种氧氮化物可用，因此需要开发替代的制造策略。在这里，我们介绍了这样一种替代策略，包括前体微结构控制的氨解作用。这导致钙钛矿家族成员LaTa（IV）O ₂ N含有不寻常的Ta ⁴⁺阳离子。调整后的前驱体微观结构以及氨气浓度是精确控制LaTa（O，N）_3中的氧化态和O：N比的关键参数。镧（IV）O ₂N具有亮红色，光学带隙为1.9 eV，缺陷浓度低（光学活性）。这些独特的特性使该材料适用于可见光驱动的应用，确定的关键参数将为进一步有前途的钙钛矿家族成员的有针对性的开发设定条件。