The upconversion properties of β-NaYF4:Yb3+(10%),Er3+(1%) microprisms under different excitation conditions

Chen, Yongsheng; Zhou, Jianpeng; Jiao, Yuechao; He, Wei; Wang, Honghong; Hao, Xiuli; Lu, Jingxiao; Yang, Shi‐e

doi:10.1016/j.jlumin.2012.07.038

Cited by 13 publications

(3 citation statements)

References 11 publications

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“…[5][6][7][8][9] Among them, upconverters using Er 3+ ions that convert 1550 nm photons to 980 nm photons are applied to c-Si solar cells, [10][11][12] while those using a combination of Er 3+ and Yb 3+ , which converts 970 nm to the visible photons, to amorphous silicon (a-Si), organic, and dye-sensitized solar cells. [13][14][15][16][17] However, the absorption bands of rare-earth ions originating from f-f transitions in the NIR region (700-2100 nm) are narrow, and hence only a small fraction of the solar spectrum can be utilized. [17][18][19] Thus, to realize highly efficient solar cells, efficient upconverters with sufficiently wide absorption spectra are desired.…”

Section: Introductionmentioning

confidence: 99%

Broadband-sensitive Ni²⁺–Er³⁺ based upconverters for crystalline silicon solar cells

et al. 2016

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We have developed Ni 2+ , Er 3+ codoped CaZrO 3 broadband-sensitive upconverters that significantly broaden the sensitive range, and hence overcome the shortcomings of conventional Er 3+ doped upconverters used for crystalline silicon (c-Si) solar cells that utilize only a small fraction of the solar spectrum around 1550 nm. We have designed the combination of sensitizers and host material to utilize photons that are not absorbed by c-Si itself or Er 3+ ions. Six coordinated Ni 2+ ions substituted at the Zr 4+ sites absorb (1060-1450) nm photons and transfer the energies to the Er 3+ ions, and the Er 3+ upconverts at 980 nm. Co-doping with monovalent charge compensators such as Li + for high Er 3+ solubilisation at the Ca 2+ sites and multivalent ions (Nb 5+ ) for stabilization of Ni 2+ at the Zr 4+ sites is essential. In addition to 1450-1600 nm (z2 Â 10 20 m À2 s À1 ) photons directly absorbed by the Er 3+ ions, we have demonstrated upconversion of 1060-1450 nm (z6 Â 10 20 m À2 s À1 ) photons in the Ni 2+ absorption band to 980 nm photons using the CaZrO 3 :Ni 2+ ,Er 3+ upconverters. Compared with the current density gain of present c-Si solar cells ($40 mA cm À2 ), the upconverted photons could increase this by $7.3 mA cm À2 , which is about 18% improvement. This architecture for broadband-sensitive upconversion may pave a new direction for the improvement in efficiency of the present c-Si solar cells to surpass the limiting conversion efficiency of single-junction solar cells.

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Section: Introductionmentioning

confidence: 99%

Broadband-sensitive Ni²⁺–Er³⁺ based upconverters for crystalline silicon solar cells

et al. 2016

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“…Er 3+ 离子, 使其实现了 2 H 11/2 , 4 S 3/2 及 4 F 9/2 激发态能级的的粒子布居 [26] . 微弱 [18] . 然而, 当高浓度Yb 3+ 离子与Er 3+ 离子共 (核)→Er 3+ (核)能量传递实现其激发态能级的布居 [29] .…”

Section: Yb 3+ 离子将获取的激发能通过能量传递给了周围unclassified

“…接着将2.0 mL Yb(NO 3 ) 3 与Er(NO 3 ) 3 @ NaYbF 4 @NaYF 4 核-壳-壳结构微米盘的制备流程与上述基本相同 [17] . 柠檬酸纳抑制微米晶体的纵向生长 [18] . [19,20] .…”

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Enhancement mechanism of red up-conversion emission in single NaYbF4:2%Er3+@NaYbF4 micron core-shell structure

Yan,

Zhang,

Zhang

et al. 2024

Acta Phys. Sin.

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The construction of core-shell structure can effectively reduce the quenching effect on the surface of materials and realize the regulation of ion-ion interaction, which has become one of the effective ways to enhance and regulate the spectral characteristics of rare-earth upconversion luminescent materials. In this paper, a variety of NaYbF4: 2%Er3+ micron core-shell structures were constructed with the help of epitaxial growth technology, which effectively enhanced the red upconversion emission of Er3+ions. The prepared microcrystals with core-shell structures are all hexagonal phase microdisks, and their sizes are relatively uniform. In order to better obtain the material spectral data, a confocal microscopic spectroscopy testing system was used to study spectral properties. Under 980 nm near-infrared laser excitation, the red emission intensity of single NaYbF4:2%Er3+@NaYbF4@NaYF4core-shell-shell microdisk is 4.6 times higher than that of NaYbF4:2%Er3+ micron disk, and the red-to-green ratio is increased from 6.3 to 8.1. Meanwhile, Ho3+ ions were introduced into the NaYbF4:2%Er3+@NaYbF4: 2%Ho3+@NaYF4 core-shell-shell microdisk, and the red emission intensity was nearly 6.7 times higher than that of single NaYbF4: 2%Er3+ microdisk, and the red-to-green ratio increased from 6.3 to 9.4 by means of ion-to-ion interaction. Through the study of microcrystal spectral characteristics and luminescence kinetics of different core-shell structures, showing that the red emission enhancement of Er3+ ions is mainly derived from the construction of different core-shell structures, which can effectively enhance the cross-relaxation between Er3+ ions, the energy back transfer between Yb3+ and Er3+ ions, and the energy transfer between Ho3+ ions to Er3+ ions. The micron core-shell structures with efficient red emission in this paper has great application prospects in the fields of luminescence, anti-counterfeiting and optoelectronic devices.

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Upconversion for Photovoltaics – a Review of Materials, Devices and Concepts for Performance Enhancement

Goldschmidt

Fischer

2015

Advanced Optical Materials

413

266

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Upconversion of low‐energy photons into high‐energy photons increases the efficiency of photovoltaic devices by converting photons with energies below the absorption threshold of the solar cell into photons that can be utilized. In this review, an overview is provided of quantitative studies of the upconversion quantum yield of upconverter materials, and of the achieved efficiency enhancements in upconverting solar cell devices. Different materials and devices are compared based on well‐defined figures‐of‐merit and the challenges to their accurate measurement are discussed. Internal upconversion quantum yields above 13% have been reported both for Er3+‐based materials as well as for organic upconverters, using irradiance values below 0.4 W cm−2. On the upconverting solar cell device level, relative enhancements of the solar cells' short‐circuit currents by up to 0.55% have been achieved. These values document progress by orders of magnitude achieved in the last years. However, they also show that the field of upconversion needs further development to become a relevant technology option in photovoltaics. Different options regarding how upconversion performance can be increased further in the future are outlined.

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The upconversion properties of β-NaYF4:Yb3+(10%),Er3+(1%) microprisms under different excitation conditions

Cited by 13 publications

References 11 publications

Broadband-sensitive Ni²⁺–Er³⁺ based upconverters for crystalline silicon solar cells

Broadband-sensitive Ni²⁺–Er³⁺ based upconverters for crystalline silicon solar cells

Enhancement mechanism of red up-conversion emission in single NaYbF<sub>4</sub>:2%Er<sup>3+</sup>@NaYbF<sub>4 </sub>micron core-shell structure

Upconversion for Photovoltaics – a Review of Materials, Devices and Concepts for Performance Enhancement

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The upconversion properties of β-NaYF4:Yb3+(10%),Er3+(1%) microprisms under different excitation conditions

Cited by 13 publications

References 11 publications

Broadband-sensitive Ni2+–Er3+ based upconverters for crystalline silicon solar cells

Broadband-sensitive Ni2+–Er3+ based upconverters for crystalline silicon solar cells

Enhancement mechanism of red up-conversion emission in single NaYbF<sub>4</sub>:2%Er<sup>3+</sup>@NaYbF<sub>4 </sub>micron core-shell structure

Upconversion for Photovoltaics – a Review of Materials, Devices and Concepts for Performance Enhancement

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Broadband-sensitive Ni²⁺–Er³⁺ based upconverters for crystalline silicon solar cells

Broadband-sensitive Ni²⁺–Er³⁺ based upconverters for crystalline silicon solar cells