La_0.5Sr_0.5Co_1-xNi_xO_3-δ (x = 0, 0.1, 0.3, 0.5) ceramics were prepared via tape casting and solid state reaction process. The influence of Ni concentration on the optical properties of La_0.5Sr_0.5Co_1-xNi_xO_3-δ has been investigated. Results showed that the reflectance in the range of 0.3–15 μm decreased with the increment of Ni concentration, thereby causing a change in the color phase parameters and emissivity. Based on the difference in L* values and emissivity, the letters (HOT) and QR codes (NJTECH) were fabricated. The developed letters and QR codes could be identified both at room and high temperatures. Furthermore, the QR codes were read out successfully even underwent heat treatment at 1000 °C. The results in this work demonstrate a new application of La_0.5Sr_0.5Co_1-xNi_xO_3-δ ceramics.

通过流延铸造和固态反应过程制备了La _0.5 Sr _0.5 Co _1-x Ni _x O3 _-δ（x = 0，0.1，0.3，0.5）陶瓷。Ni浓度对La _0.5 Sr _0.5 Co _1-x Ni _x O3 _-δ光学性能的影响已被调查。结果表明，随着Ni浓度的增加，反射率在0.3-15μm范围内降低，从而导致色相参数和发射率发生变化。根据L *值和发射率的差异，制作了字母（HOT）和QR码（NJTECH）。在室温和高温下都可以识别出已开发的字母和QR码。此外，即使在1000°C的热处理下，QR码也能成功读取。这项工作的结果证明了La _0.5 Sr _0.5 Co _1-x Ni _x O3 _-δ陶瓷的新应用。