Owing to the free of noise, mechanical component, working fluid, and chemical reaction, thermoelectric cooling is regarded as a suitable solution to address the greenhouse emission for the broad cooling scenarios. Here, the significant progress of state‐of‐the‐art thermoelectric coolers is comprehensively summarized and the related aspects of materials, fundamental design, heat sinks, and structures, are overviewed. Particularly, the usage of thermoelectric coolers in smart city, greenhouse, and personal and chip thermal management is highlighted. In the end, current challenges and future opportunities for further improvement of designs, performance, and applications of thermoelectric coolers are pointed out.

Devices. -The title carbazole hybrids (VI) are obtained by introducing carbazole, pyridine, and triazolopyridinone moieties into the oxadiazole building block. These chromophores play assistant roles in controlling fundamental photolytic process, due to the electron-donating nature, excellent photoconductivity, and flexible structure properties. Spectroscopic studies and the measurements of cyclic voltammogram indicate that hybrids (VI) are highly efficient bluish-green electroluminescent materials.

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