Color-preserving daytime passive radiative cooling based on Fe3+-doped Y2Ce2O7

Dang, Saichao; Xiang, Jingbo; Yao, Hongxin; Yang, Fan; Ye, Hong

doi:10.1016/j.enbuild.2022.111861

Cited by 14 publications

(19 citation statements)

References 54 publications

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“…As shown in Table 1, the radiative cooling power in the two atmospheric windows are mostly through the 8-13 µm window which is investigated by most relevant works. [1][2][3][4][5][6][7][8][9][10][11][12][13][14] The cooling power through 16-25 µm window can reach ≈40 W m −2 , which shouldn't be neglected. Generally, the ideal design shows a best cooling performance.…”

Section: Theoretical Cooling Performancementioning

confidence: 99%

“…[1][2][3][4][5][6] Without any external driving energy input, this cooling method can be extensively applied in energy saving applications such as buildings, photoelectric devices, or the thermal management of spacecraft. [7][8][9][10][11] According to the mechanism of this cooling technology, efficient DPRC should have minimum absorption of incoming solar radiation and maximum emission of infrared thermal radiation through the atmospheric window (8-13 µm) for releasing heat. [12] A classic DPRC material consists of a bottom opaque metallic layer (≈150 nm), that is, Al or Ag, [13][14][15][16][17][18] which can reflect incident sunlight, and a rest top structure which emits in the atmospheric window and doesn't absorb sunlight as well.…”

Section: Introductionmentioning

confidence: 99%

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An Ultrathin Transparent Radiative Cooling Photonic Structure with a High NIR Reflection

Dang

Wang

2022

Adv Materials Inter

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What's more, to make the DPRC devices economical and manufactured in large scale, polymers and microspheres are applied. [15,[19][20][21][22] General DPRC applications should selectively emit thermal radiation in the atmospheric window and minimize solar absorption, simultaneously. However, for transparent applications (e.g., transparent electrode, [23,24] display device, [25][26][27] and window [28][29][30][31] ), only visible light (0.38-0.78 µm) is allowed for view or illumination. The rest of the solar radiation (mainly NIR: 0.78-2.5 µm), if transmitted will cause overheating or additional energy for cooling.Many transparent NIR filters are proposed to block the NIR solar radiation in recent years. [27][28][29][30][31][32][33][34][35][36][37][38][39][40][41] However, several NIR filters block the NIR solar radiation by absorption, [28][29][30][31][32][33][34][35][36] for example, W 18 O 49 , [28] Cu 2−x S/SiO 2 [29] and (NH4) x WO 3 , [32] which will increase the additional heating load as well. [33] To reduce the heating load, it is important to filter the NIR solar radiation by reflection. [33][34][35][36][37][38][39][40][41] Such NIR reflecting filters can be realized by a conductive layer, [33][34][35][36][37][38][39][40][41] for example, ITO [37,40] and dielectric/metal/ dielectric (D/M/D) structure. [38,39,41] However, these NIR reflecting filters will also show high reflections (low emissions) within mid-infrared (MIR) bands, which suppress the radiative cooling. [37][38][39][40][41][42][43][44] As the radiative cooling power in 8-13 µm is significant, [1][2][3][4][5][6] the MIR radiation heat transfer between the cold sky and a NIR filter shouldn't be neglected. To realize high visible transmission, NIR reflection and MIR emission, simultaneously, one can combine a NIR reflecting filter (e. g., D/M/D [38][39][40][41][42][43][44] or ITO [37] ) and a transparent MIR emitting structure (e. g., SiO 2 [45,46] or PDMS [37,47] ). As a common visible transparent NIR reflecting film in energy saving, a D/M/D structure is often used as a spectrally selective filter that can transmit most of the visible light and reflect NIR solar radiation. [38][39][40][41][42][43][44][45][46] Dielectric layers can enhance visible transmission due to a destructive multi-reflective interference and a thin metal layer is responsible for NIR reflection, [38][39][40][41][42][43][44][45] which is higher than that of an ITO structure. [38] As a polymer, PDMS will age especially under sunlight [48,49] and it is much thicker than a SiO 2 based emitter. [45,46] As a potential material for transparent radiative cooling, silica is stable with high transmittance over most of the solar wavelength range and also exhibits a strong phononpolariton resonance in the wavelength range of 8-13 µm. [45,46] However, there is an emission dip within 8-13 µm for a silica layer. [45] With 2D silica photonic crystals [45] or gratings, [46] silica can show enhanced MIR emission. As a result, it is expected With a high NIR reflection, a transparent radiativ...

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Section: Theoretical Cooling Performancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An Ultrathin Transparent Radiative Cooling Photonic Structure with a High NIR Reflection

Dang

Wang

2022

Adv Materials Inter

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“…The color characteristic of CA NF CSDRC is described numerically by three parameters L, a and b, where 'L' represents the lightness (0 for black, 100 for white). 40,41 S1, ESI †). To intuitively manifest these colors, we also mark such different color coordinate values of NF CSDRC in the commonly used and perceptually uniform CIE (1931) color space.…”

Section: Introductionmentioning

confidence: 99%

Selective spectral absorption of nanofibers for color-preserving daytime radiative cooling

Yang

et al. 2023

Mater. Horiz.

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Section: Introductionmentioning

confidence: 99%

“…A few efforts were also made to extend this passive cooling method from colorless objects to colorful ones [28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43] . On the one hand, different strategies were used to reduce the temperature of traditional colorful materials by increasing reflection of near-IR light and emission of mid-IR light as much as possible [28][29][30][31][32][33][34][35][36][37][38][39][40] . However, due to the fact that the absorption of undesired complementary light (𝜺und ≠0) is inevitable, and the absorption of near-IR is also very hard to decrease for some colors (such as highly saturated blue and green) as shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Cooling colors below the ambient temperature

Wang¹,

xing²,

shu³

et al. 2023

Preprint

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The colors of objects are generally originated from reflecting desired light in the desired direction and absorbing the undesired light, which will substantially produce heating. Many efforts have been made to focus on cooling the colorful objects. However, a cooling strategy to cool colorful objects beyond a limit of temperature below the ambient temperature while fully preserving the excellent color properties of high saturation and large viewing field is still a great challenge, as it is rather difficult to independently control the four light bands simultaneously: high diffusion of desired light, low absorption of undesired complementary visible light, low absorption of near-IR light, and high emission of mid-IR light. Inspired by Morpho butterflies, we reported here a robust configure consisting of a multilayer, a disorder structure, and a total reflection layer to cool colorful objects to overcome the challenge. Numerical simulations and experimental measurements demonstrated that our configure can cool a class of colorful objects to not only a temperature of around 2 °C below the ambient temperature, but also with ultra-high saturations (100%) and a wide range of viewing angles (±60°), indicating a great potential for energy sustainability of colorful objects such as buildings, vehicles, facilities, and equipment.

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Color-preserving daytime passive radiative cooling based on Fe3+-doped Y2Ce2O7

Cited by 14 publications

References 54 publications

An Ultrathin Transparent Radiative Cooling Photonic Structure with a High NIR Reflection

An Ultrathin Transparent Radiative Cooling Photonic Structure with a High NIR Reflection

Selective spectral absorption of nanofibers for color-preserving daytime radiative cooling

Cooling colors below the ambient temperature

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