Smart building block with colored radiative cooling devices and quantum dot light emitting diodes

Sang Yeop Lee, Dongwoo Chae, Jungho Kim, Seongkeun Oh, Hangyu Lim, Jiwan Kim, Heon Lee, Soong Ju Oh

Research output: Contribution to journalArticlepeer-review


In this study, we design a smart building block with quantum-dot light-emitting diode (QLED) and colored radiative cooling devices. A smart light-emitting building block is fabricated using a bottom-inverted QLED that emits green light, an insulating layer, and a top radiative cooling structure that emits mid-infrared light. The heat generated during QLED operation is measured and analyzed to investigate the correlation between heat and QLED degradation. The top cooling part is designed to have no impact on the QLED's performance and utilizes Ag-polydimethylsiloxane as a visible-light reflector and mid-infrared absorber/emitter. For the colored cooling part, white radiative cooling paint is used instead of Ag-polydimethylsiloxane to improve cooling performance, and red and yellow paints are employed to realize vivid red and yellow colors, respectively. We demonstrate a smart imitation house system with a smart light-emitting building block as the roof and analyze the cooling of the heat generated during QLED operation. A maximum cooling effect of up to 9.6 °C is observed compared to the imitation house system without the smart light-emitting building block, effectively dissipating heat generated during QLED operation. The smart light-emitting building block presented in this study opens new avenues in the fields of lighting and cooling systems.

Original languageEnglish
Pages (from-to)1664-1672
Number of pages9
Issue number4
Publication statusPublished - 2024 Jan 3

Bibliographical note

Publisher Copyright:
© 2024 The Royal Society of Chemistry

ASJC Scopus subject areas

  • General Materials Science


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