Ultra-high photoluminescent quantum yield of β-NaYF_4: 10% Er^3+ via broadband excitation of upconversion for photovoltaic devices

MacDougall, Sean Kye Wallace; Ivaturi, Aruna; Marqués-Hueso, José; Krämer, Karl; Richards, Bryce S.

doi:10.1364/oe.20.00a879

Cited by 80 publications

(57 citation statements)

References 22 publications

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“…An essential aspect in the development of new upconversion approaches and materials for harvesting lowenergy solar photons is their ability to work directly under sunlight and upconvert low-energy photons to high-energy ones 2,6,7,13,14,[18][19][20]39 . We therefore further demonstrated the feasibility of our thermal radiation-based approach towards sunlight.…”

Section: Discussionmentioning

confidence: 99%

“…Intensive efforts are currently being made to synthesize upconversion materials with increasing power upconversion efficiencies 2,7,[14][15][16][17][18][19] . In addition, there have been two recent studies with pulsed laser sources employed for excitation 20,21 , where the excitation power densities in each pulse are much higher than the corresponding timeaveraged excitation power densities. The reported upconversion quantum yields are 16.2 and 16% and the corresponding power upconversion efficiencies are B25 and 19%.…”

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confidence: 99%

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Photon energy upconversion through thermal radiation with the power efficiency reaching 16%

et al. 2014

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The efficiency of many solar energy conversion technologies is limited by their poor response to low-energy solar photons. One way for overcoming this limitation is to develop materials and methods that can efficiently convert low-energy photons into high-energy ones. Here we show that thermal radiation is an attractive route for photon energy upconversion, with efficiencies higher than those of state-of-the-art energy transfer upconversion under continuous wave laser excitation. A maximal power upconversion efficiency of 16% is achieved on Yb 3 þ -doped ZrO 2 . By examining various oxide samples doped with lanthanide or transition metal ions, we draw guidelines that materials with high melting points, low thermal conductivities and strong absorption to infrared light deliver high upconversion efficiencies. The feasibility of our upconversion approach is further demonstrated under concentrated sunlight excitation and continuous wave 976-nm laser excitation, where the upconverted white light is absorbed by Si solar cells to generate electricity and drive optical and electrical devices.

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Section: Discussionmentioning

confidence: 99%

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Photon energy upconversion through thermal radiation with the power efficiency reaching 16%

et al. 2014

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“…7 Recently, an IR!NIR iUC-QY of 16.2% for PFCB with 55.6 w/w% bNaYF 4 :10% Er 3þ has been demonstrated for a sample that had neither been optimized in Er 3þ concentration nor the phosphor concentration, using a broadband excitation (bandwidth of 61 nm) and a power density of $2 Â 10 6 Wm À2 . 21 Both of these power density values are much higher than those used for PV applications. However, using the optimized Er 3þ dopant and phosphor concentration and an ideal matrix in conjunction with broadband excitation and emerging technologies (such as spectral concentration using quantum dots, 35 or photonic structures, 36 or near field enhancement using plasmonic structures 37,38 ) would significantly improve efficiencies of low-power solar upconversion.…”

Section: Fig 7 (A)mentioning

confidence: 98%

“…4,8 More recently, an extremely high iUC-QY of 16.2% 6 0.5% has been demonstrated in 10 mol% Er 3þ doped b-NaYF 4 when excited by a broadband laser source with bandwidth in the range of 61-80 nm. 21 However, there is a lack of systematic optimization of the Er 3þ doping in b-NaYF 4 :Er 3þ for PV device applications in literature.…”

Section: Introductionmentioning

confidence: 99%

Optimizing infrared to near infrared upconversion quantum yield of β-NaYF4:Er3+ in fluoropolymer matrix for photovoltaic devices

Ivaturi

MacDougall

Martín-Rodríguez

et al. 2013

Journal of Applied Physics

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The present study reports for the first time the optimization of the infrared (1523 nm) to near-infrared (980 nm) upconversion quantum yield (UC-QY) of hexagonal trivalent erbium doped sodium yttrium fluoride (b-NaYF 4 :Er 3þ ) in a perfluorocyclobutane (PFCB) host matrix under monochromatic excitation. Maximum internal and external UC-QYs of 8.4% 6 0.8% and 6.5% 6 0.7%, respectively, have been achieved for 1523 nm excitation of 970 6 43 Wm À2 for an optimum Er 3þ concentration of 25 mol% and a phosphor concentration of 84.9 w/w% in the matrix. These results correspond to normalized internal and external efficiencies of 0.86 6 0.12 cm 2 W À1 and 0.67 6 0.10 cm 2 W À1 , respectively. These are the highest values ever reported for bNaYF 4 :Er 3þ under monochromatic excitation. The special characteristics of both the UC phosphor b-NaYF 4 :Er 3þ and the PFCB matrix give rise to this outstanding property. Detailed power and time dependent luminescence measurements reveal energy transfer upconversion as the dominant UC mechanism. V C 2013 AIP Publishing LLC. [http://dx

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“…The combination of this two recent approaches open-up new possibilities for the use of up converting particles in many different applications: in imaging for biology of course but also for photodynamic therapy [129,130,131,132] or for photovoltaics [133].…”

Section: Up Conversion Of Photoluminescencementioning

confidence: 99%

Engineered inorganic core/shell nanoparticles

et al. 2014

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It has been for a long time recognized that nanoparticles are of great scientific interest as they are effectively a bridge between bulk materials and atomic structures. At first, size effects occurring in single elements have been studied. More recently, progress in chemical and physical synthesis routes permitted the preparation of more complex structures. Such structures take advantages of new adjustable parameters including stoichiometry, chemical ordering, shape and segregation opening new fields with tailored materials for biology, mechanics, optics magnetism, chemistry catalysis, solar cells and microelectronics. Among them, core/shell structures are a particular class of nanoparticles made with an inorganic core and one or several inorganic shell layer(s). In earlier work, the shell was merely used as a protective coating for the core. More recently, it has been shown that it is possible to tune the physical properties in a larger range than that of each material taken separately. The goal of the present review is to discuss the basic properties of the different types of core/shell nanoparticles including a large variety of heterostructures. We restrict ourselves on all inorganic (on inorganic/inorganic) core/shell structures. In the light of recent developments, the applications of inorganic core/shell particles are found in many fields including biology, chemistry, physics and engineering. In addition to a representative overview 2 of the properties, general concepts based on solid state physics are considered for material selection and for identifying criteria linking the core/shell structure and its resulting properties. Chemical and physical routes for the synthesis and specific methods for the study of core/shell nanoparticle are briefly discussed.

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Ultra-high photoluminescent quantum yield of β-NaYF_4: 10% Er^3+ via broadband excitation of upconversion for photovoltaic devices

Cited by 80 publications

References 22 publications

Photon energy upconversion through thermal radiation with the power efficiency reaching 16%

Photon energy upconversion through thermal radiation with the power efficiency reaching 16%

Optimizing infrared to near infrared upconversion quantum yield of β-NaYF4:Er3+ in fluoropolymer matrix for photovoltaic devices

Engineered inorganic core/shell nanoparticles

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