Institute of Physics, University of São Paulo, São Paulo BR-05508-900, SP, Brazil.
The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
Molecules. 2021 May 13;26(10):2882. doi: 10.3390/molecules26102882.
Luminescent inorganic materials are used in several technological applications such as light-emitting displays, white LEDs for illumination, bioimaging, and photodynamic therapy. Usually, inorganic phosphors (e.g., complex oxides, silicates) need high temperatures and, in some cases, specific atmospheres to be formed or to obtain a homogeneous composition. Low ionic diffusion and high melting points of the precursors lead to long processing times in these solid-state syntheses with a cost in energy consumption when conventional heating methods are applied. Microwave-assisted synthesis relies on selective, volumetric heating attributed to the electromagnetic radiation interaction with the matter. The microwave heating allows for rapid heating rates and small temperature gradients yielding homogeneous, well-formed materials swiftly. Luminescent inorganic materials can benefit significantly from the microwave-assisted synthesis for high homogeneity, diverse morphology, and rapid screening of different compositions. The rapid screening allows for fast material investigation, whereas the benefits of enhanced homogeneity include improvement in the optical properties such as quantum yields and storage capacity.
发光无机材料在多种技术应用中都有使用，例如发光显示器、照明用白色发光二极管、生物成像和光动力疗法。通常，无机荧光粉（例如，复合氧化物、硅酸盐）需要高温，并且在某些情况下需要特定的气氛才能形成或获得均匀的组成。前体的低离子扩散和高熔点导致这些固态合成的加工时间较长，当应用传统加热方法时会消耗能源。微波辅助合成依赖于选择性、体积加热，归因于电磁辐射与物质的相互作用。微波加热可实现快速加热速率和小温度梯度，从而快速生成均匀、成型良好的材料。发光无机材料可通过微波辅助合成显著受益，获得高均匀性、多种形态和快速筛选不同组成。快速筛选可实现快速材料研究，而增强均匀性的好处包括提高光学性能，例如量子产率和存储容量。
