Near-infrared down-conversion in Yb3+:TiO2 for solar cell applications

Perumal, Rajesh Narayana; Subalakshmi, G.

doi:10.1007/s10854-016-5734-4

Cited by 4 publications

(2 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The PL emission peaks at 987 and 1019–1035 nm correspond to transitions between the Stark levels of the 2 F 5/2 excited state and the 2 F 7/2 ground state of Yb 3+ : the sharp peak at 987 nm corresponds to the transition 5 → 1, between the lowest Stark levels of each J-manifold, whereas the intense peak at 1019–1035 nm is attributed to longer wavelength transitions from level 5 to higher lying Stark levels of the ground state, followed by thermalization to the lower J-level [ 15 ], without well resolved Stark splitting due to the amorphous nature of the host matrix. The continuous decrease of the measured PL lifetime with increasing Yb content, especially in the case of the phosphosilicate glass matrix ( Table 1 ), indicates the occurrence of concentration quenching phenomena.…”

Section: Discussionmentioning

confidence: 99%

Sol-Gel Derived Active Material for Yb Thin-Disk Lasers

2017

View full text Add to dashboard Cite

A ytterbium doped active material for thin-disk laser was developed based on aluminosilicate and phosphosilicate glass matrices containing up to 30 mol% YbO1.5. Thick films and bulk samples were prepared by sol-gel processing. The structural nature of the base material was assessed by X-ray diffraction and Raman spectroscopy and the film morphology was evidenced by scanning electron microscopy. The photoluminescence (PL) properties of different compositions, including emission spectra and lifetimes, were also studied. Er3+ was used as an internal reference to compare the intensities of the Yb3+ PL peaks at ~ 1020 nm. The Yb3+ PL lifetimes were found to vary between 1.0 and 0.5 ms when the Yb concentration increased from 3 to 30 mol%. Based on a figure of merit, the best active material selected was the aluminosilicate glass composition 71 SiO2-14 AlO1.5-15 YbO1.5 (in mol%). An active disk, ~ 36 μm thick, consisting of a Bragg mirror, an aluminosilicate layer doped with 15 mol% Yb and an anti-reflective coating, was fabricated.

show abstract

Section: Discussionmentioning

confidence: 99%

Sol-Gel Derived Active Material for Yb Thin-Disk Lasers

2017

View full text Add to dashboard Cite

show abstract

“…Near‐infrared (NIR) down‐conversion species are capable of emitting two or more NIR photons after absorption of single high‐energy UV/Vis photons to minimize the problem of electronic recombination and thermal relaxation in solar cells . For instance, the trivalent ytterbium ion (Yb 3+ ) can emit photons around 1000 nm, assigned to the 2 F 5/2 → 2 F 7/2 transition, which matches the energy gap of silicon (≈1.1 eV), corresponding to a maximum spectral response , . Yb 3+ is a perfect candidate for solar spectral conversion by the luminescence down‐conversion (LDC) technique, which can be achieved in the Mn 2+ /Yb 3+ co‐doped phosphors , .…”

Section: Introductionmentioning

confidence: 99%