scholarly journals Down-Shifting in the YAM: Ce3+ + Yb3+ System for Solar Cells

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2753
Author(s):  
Bartosz Fetliński ◽  
Sebastian Turczyński ◽  
Michał Malinowski ◽  
Paweł Szczepański
Keyword(s):  
Energy Transfer ◽  
Emission Intensity ◽  
Potential Application ◽  
Single Photon ◽  
Solar Spectrum ◽  
Excitation Power ◽  
Photovoltaic Devices ◽  
Photoluminescence Properties ◽  
System A ◽  
Down Conversion

In this work, we investigate Ce3+ to Yb3+ energy transfer in Y4Al2O9 (YAM) for potential application in solar spectrum down-converting layers for photovoltaic devices. Photoluminescence properties set, of 10 samples, of the YAM host activated with Ce3+ and Yb3+ with varying concentrations are presented, and the Ce3+ to Yb3+ energy transfer is proven. Measurement of highly non-exponential luminescence decays of Ce3+ 5d band allowed for the calculation of maximal theoretical quantum efficiency, of the expected down-conversion process, equal to 123%. Measurements of Yb3+ emission intensity, in the function of excitation power, confirmed the predominantly single-photon downshifting character of Ce3+ to Yb3+ energy transfer. Favorable location of the Ce3+ 5d bands in YAM makes this system a great candidate for down-converting, and down-shifting, luminescent layers for photovoltaics.

scholarly journals High efficiency excitation energy transfer in biohybrid quantum dot–bacterial reaction center nanoconjugates

2021 ◽  
Author(s):  
Giordano Amoruso ◽  
Juntai Liu ◽  
Daniel W Polak ◽  
Kavita Tiwari ◽  
Michael R Jones ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Quantum Dot ◽  
Time Scale ◽  
High Efficiency ◽  
Light Harvesting ◽  
Single Photon ◽  
Visible Region ◽  
Solar Spectrum ◽  
Direct Determination

Reaction centers (RCs) are the pivotal component of natural photosystems, converting solar energy into the potential difference between separated electrons and holes that is used to power much of biology. RCs from anoxygenic purple photosynthetic bacteria such as Rhodobacter sphaeroides only weakly absorb much of the visible region of the solar spectrum which limits their overall light-harvesting capacity. For in vitro applications such as bio-hybrid photodevices this deficiency can be addressed by effectively coupling RCs with synthetic light-harvesting materials. Here, we studied the time scale and efficiency of Förster resonance energy transfer (FRET) in a nanoconjugate assembled from a synthetic quantum dot (QD) antenna and a tailored RC engineered to be fluorescent. Time-correlated single photon counting spectroscopy of biohybrid conjugates enabled the direct determination of FRET from QDs to attached RCs on a time scale of 26.6 ± 0.1 ns and with a high efficiency of 0.75 ± 0.01.

Photoluminescence properties and energy transfer studies of Ba2YAlO5: Sm3+, Eu3+ orange-red phosphors

Optik ◽  
2021 ◽  
Vol 238 ◽  
pp. 166774
Author(s):  
Huan Duan ◽  
Ruirui Cui ◽  
Min Zhang ◽  
Chaoyong Deng
Keyword(s):  
Energy Transfer ◽  
Photoluminescence Properties ◽  
Red Phosphors

scholarly journals Melt-Spun Photoluminescent Polymer Optical Fibers for Color-Tunable Textile Illumination

Materials ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1740
Author(s):  
Konrad Jakubowski ◽  
Manfred Heuberger ◽  
Rudolf Hufenus
Keyword(s):  
Energy Transfer ◽  
Optical Fibers ◽  
Color Space ◽  
Emission Spectra ◽  
Wide Range ◽  
Color Tunable ◽  
Melt Spun ◽  
Polymer Optical Fibers ◽  
Collective Emission ◽  
Down Conversion

The increasing interest in luminescent waveguides, applied as light concentrators, sensing elements, or decorative illuminating systems, is fostering efforts to further expand their functionality. Yarns and textiles based on a combination of distinct melt-spun polymer optical fibers (POFs), doped with individual luminescent dyes, can be beneficial for such applications since they enable easy tuning of the color of emitted light. Based on the energy transfer occurring between differently dyed filaments within a yarn or textile, the collective emission properties of such assemblies are adjustable over a wide range. The presented study demonstrates this effect using multicolor, meltspun, and photoluminescent POFs to measure their superimposed photoluminescent emission spectra. By varying the concentration of luminophores in yarn and fabric composition, the overall color of the resulting photoluminescent textiles can be tailored by the recapturing of light escaping from individual POFs. The ensuing color space is a mean to address the needs of specific applications, such as decorative elements and textile illumination by UV down-conversion.

A new single-phase white-light-emitting CaWO4:Dy3+ phosphor: synthesis, luminescence and energy transfer

RSC Advances ◽  
2015 ◽  
Vol 5 (77) ◽  
pp. 62527-62533 ◽  
Author(s):  
Yang Zhang ◽  
Weitao Gong ◽  
Jingjie Yu ◽  
Hongchang Pang ◽  
Qiang Song ◽  
...  
Keyword(s):  
Energy Transfer ◽  
White Light ◽  
Single Phase ◽  
Transfer Mechanism ◽  
Energy Transfer Mechanism ◽  
Photoluminescence Properties ◽  
Light Emitting

A new single-phase white-emitting CaWO4:Dy3+ phosphor has been successfully synthesized and the photoluminescence properties and energy-transfer mechanism have been carefully investigated.

scholarly journals Spectral shifting and NIR down-conversion in Bi3+/Yb3+ co-doped Zn2GeO4

2014 ◽  
Vol 2 (38) ◽  
pp. 8083-8088 ◽  
Author(s):  
Guojun Gao ◽  
Mingying Peng ◽  
Lothar Wondraczek
Keyword(s):  
Solar Spectrum ◽  
Model System ◽  
Spectral Shifting ◽  
Down Conversion ◽  
Co Doped

We report on Zn2GeO4 co-doped with Yb3+ and Bi3+ as a model system for ultra-efficient down-conversion of the UV-A/blue part of the solar spectrum to the NIR.

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