Physical performance limitations of luminescent down-conversion layers for photovoltaic applications

Boccolini, Alessandro; Marqués-Hueso, José; Chen, D.; Wang, Yuansheng; Richards, Bryce S.

doi:10.1016/j.solmat.2013.11.005

Cited by 38 publications

(27 citation statements)

References 25 publications

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“…[5][6][7] In this regard, the ongoing claims of observing an efficient quantum cutting especially in the case of Ce 3þ /Eu 2þ -Yb 3þ codoped materials raises serious concerns and confusion. [8][9][10][11] Recent studies on Ce 3þ (donor)-Yb 3þ (acceptor) and other similar redox ions codoped materials have demonstrated that the donor de-excitation and donor to acceptor energy sensitization involves an electron transfer process and not the cooperative energy transfer process as was considered earlier. [12][13][14][15] Electron transfer and energy transfer interactions are well established processes responsible for several physical phenomena such as the energy storage, scintillation, afterglow, quenching, and sensitization.…”

Section: In Borate Glassmentioning

confidence: 86%

Experimental insights on the electron transfer and energy transfer processes between Ce3+-Yb3+ and Ce3+-Tb3+ in borate glass

Sontakke

Ueda

Katayama

et al. 2015

Applied Physics Letters

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A facile method to describe the electron transfer and energy transfer processes among lanthanide ions is presented based on the temperature dependent donor luminescence decay kinetics. The electron transfer process in Ce 3þ -Yb 3þ exhibits a steady rise with temperature, whereas the Ce 3þ -Tb 3þ energy transfer remains nearly unaffected. This feature has been investigated using the rate equation modeling and a methodology for the quantitative estimation of interaction parameters is presented. Moreover, the overall consequences of electron transfer and energy transfer process on donor-acceptor luminescence behavior, quantum efficiency, and donor luminescence decay kinetics are discussed in borate glass host. The results in this study propose a straight forward approach to distinguish the electron transfer and energy transfer processes between lanthanide ions in dielectric hosts, which is highly advantageous in view of the recent developments on lanthanide doped materials for spectral conversion, persistent luminescence, and related applications. V C 2015 AIP Publishing LLC. [http://dx.

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Section: In Borate Glassmentioning

confidence: 86%

Experimental insights on the electron transfer and energy transfer processes between Ce3+-Yb3+ and Ce3+-Tb3+ in borate glass

Sontakke

Ueda

Katayama

et al. 2015

Applied Physics Letters

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“…By definition, the maximum theoretical achievable iPLQY for an UC process is 50%, which is difficult to achieve experimentally. The short-fall between the theoretical limit and the measured values is caused by several factors including nonradiative losses like multiphonon relaxation, concentration quenching, and self-absorption [9][10][11]. Additionally, the ePLQY is also constrained by the absorbance of the UC material, whose optical performances may be considerably lowered if a weak absorption cross section at the pump wavelength is present.…”

mentioning

confidence: 99%

“…Recently, a self-absorption loss mechanism has been reported in erbium (Er 3 )-doped barium yttrium fluoride (BaY 2 F 8 ) where it has been minimized by experimentally optimizing the thickness of the sample [13]. Moreover, an optical model describing how the self-absorption affects PLQY measurements in a DC luminescent material has been demonstrated in [11].…”

mentioning

confidence: 99%

Self-absorption in upconverter luminescent layers: impact on quantum yield measurements and on designing optimized photovoltaic devices

Boccolini¹,

Marqués-Hueso²,

Richards³

2014

Opt. Lett.

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This Letter details a theoretical investigation of self-absorption within an upconverter (UC) material, consisting of trivalent erbium (Er3+)-doped hexagonal sodium yttrium fluoride (β-NaYF4) and its implications on two experimental situations: the case of a quantum yield measurement, and on the effective performance in a UC-enhanced photovoltaic (PV) device. The study demonstrates that an optimization of the thickness is essential in order to reduce the effect of self-absorption and maximize the possible additional photocurrent that could be harvested. It also has been found that the external photoluminescence quantum yield (ePLQY) measured through an integrating sphere may result in an underestimation with respect to the performance that the UC material could achieve in a UC-PV device. Finally, it has been found the optimal thickness and the molar concentration of Er3+ ions are inversely proportional, suggesting that an optimal number (1.3-2.9·10(17)) of Er3+ ions should be contained within the UC layer.

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“…Third issue is self-absorption (also termed inner-filter effect) which has been shown to influence iPLQY values at high concentrations (typically above an absorbance of 0.1) of the active luminescent species. 21,22 Self-absorption is also more prominent for materials such as fluorescent organic dyes that exhibit lower Stokes shifts and hence exhibit a greater overlap in the absorption and emission spectrum. This process occurs when an emitted photon is re-absorbed by the sample (one or multiple times) via radiative energy transfer and can therefore reduce the iPLQY in the case of a non-unity value.…”

Section: B Determination Of Iplqymentioning

confidence: 99%

Measurement procedure for absolute broadband infrared up-conversion photoluminescent quantum yields: Correcting for absorption/re-emission

MacDougall

Ivaturi

Marqués-Hueso

et al. 2014

Review of Scientific Instruments

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The internal photoluminescent quantum yield (iPLQY)--defined as the ratio of emitted photons to those absorbed--is an important parameter in the evaluation and application of luminescent materials. The iPLQY is rarely reported due to the complexities in the calibration of such a measurement. Herein, an experimental method is proposed to correct for re-emission, which leads to an underestimation of the absorption under broadband excitation. Although traditionally the iPLQY is measured using monochromatic sources for linear materials, this advancement is necessary for nonlinear materials with wavelength dependent iPLQY, such as the application of up-conversion to solar energy harvesting. The method requires an additional measurement of the emission line shape that overlaps with the excitation and absorption spectra. Through scaling of the emission spectrum, at the long wavelength edge where an overlap of excitation does not occur, it is possible to better estimate the value of iPLQY. The method has been evaluated for a range of nonlinear material concentrations and under various irradiances to analyze the necessity and boundary conditions that favor the proposed method. Use of this refined method is important for a reliable measurement of iPLQY under a broad illumination source such as the Sun.

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Physical performance limitations of luminescent down-conversion layers for photovoltaic applications

Cited by 38 publications

References 25 publications

Experimental insights on the electron transfer and energy transfer processes between Ce3+-Yb3+ and Ce3+-Tb3+ in borate glass

Experimental insights on the electron transfer and energy transfer processes between Ce3+-Yb3+ and Ce3+-Tb3+ in borate glass

Self-absorption in upconverter luminescent layers: impact on quantum yield measurements and on designing optimized photovoltaic devices

Measurement procedure for absolute broadband infrared up-conversion photoluminescent quantum yields: Correcting for absorption/re-emission

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