NaLaF 4 :Pr 3+ ,Yb 3+ , an efficient blue to near infra-red quantum cutter

A Guille (1) , A Pereira (1) , B Moine (1)

1 ILM - Institut Lumière Matière [Villeurbanne]

In order to reduce the thermalization losses in solar cells, down-conversion of blue photons into near infra-red photons is a promising solution. In the present paper, we analyse the energy transfer processes between Pr³⁺ and Yb³⁺ in NaLaF₄ and we show that an efficient quantum-cutting process occurs. Nevertheless, we also show that a back transfer from Yb³⁺ toward the ¹G₄ level of Pr³⁺ ion leading to emission beyond 1 μm reduces the potentiality of this material as a quantum cutter for Si solar cells.

Mots clés: Emission spectroscopy; Equilibrium thermodynamics; Band gap; Intermolecular forces; Phonons; Charge coupled devices; Forbidden transition; Monochromators; Atomic and molecular spectra; Fluorescence spectroscopy

Domaines: Sciences de l'ingénieur [physics]; Chimie; Physique [physics]

A Guille, A Pereira, B Moine. NaLaF 4 :Pr 3+ ,Yb 3+ , an efficient blue to near infra-red quantum cutter. APL Materials, 2013, 1 (6), pp.062106. ⟨10.1063/1.4843455⟩. ⟨hal-03013616⟩