Photoluminescence studies of Ln3+ (Ln = Eu, Tb) doped Y(benzoate)3 complexes

Maji, S.; Kumar, Satendra; Sen, Sujoy; Sundararajan, K.

doi:10.1016/j.jlumin.2023.119950

Cited by 1 publication

(2 citation statements)

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“…The calculated UV-vis spectrum (Figure 2) coincides well with that reported by Cai et al [28]. The peak at 312 nm in the computed spectrum can be attributed to a π → π* transition in one of the three 3 DPIQC ligands (see inset in Figure 2), leading to the lowest excited singlet state S 1 , which appears at 3.98 eV (32,128 cm −1 ) above the ground state. The 3 DPIQC ligand is a triplet sensitive ligand so that efficient transfer from S 1 to the lowest triplet state T 1 , calculated to lie 2.79 eV (22,485 cm −1 ) above the ground state, is expected [10,39].…”

Section: Optical Properties Of the Eu( 3 Dpiqc) 3 Complex In Solution...supporting

confidence: 86%

“…Rare-earth-containing compounds have been the subject of extensive research in recent decades, mainly due to their interesting photophysical properties such as high quantum yields, narrow emission lines, and long-term fluorescence [1][2][3][4]. Due to these properties, these compounds have found a great number of applications in the field of opto-electronics, such as in solid-state lighting devices, temperature sensors, displays, bio-imaging applications, or solar cells [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

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Enhancing c-Si Solar Cell Efficiency in the UV Region: Photophysical Insights into the Use of Eu3+ Complexes for Down-Shifting Layer Applications

Vargas,

Nelson,

Espinoza

et al. 2023

Molecules

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[Eu(3DPIQC)3] (where DPIQC = 3-(diphenyl phosphoryl)-1-isoquinolinecarboxylate), a luminescent europium complex with antenna ligands, has been carefully embedded within a polyvinyl butyral (PVB) matrix and the resulting material was used to prepare films used as luminescent down-shifting layers (LDSLs) for crystalline Si-based solar cells. The films were characterized using photoluminescence spectroscopy, atomic force spectroscopy (AFM), UV-Vis spectroscopy, and fluorescence microscopy. The AFM analysis shows films with low surface roughness, while fluorescence microscopy revealed that the Eu complex embedded in PVB assumed a spheroidal configuration, a morphology especially beneficial for optical applications. The so-obtained LDSLs were utilized as energy converters in c-Si solar cells to enhance the utilization of high-energy photons, thereby improving their overall efficiency. The determination of photovoltaic parameters carried out before and after the deposition of the LDSLs on the c-Si cells confirms a positive effect on the efficiency of the cell. The Jsc increases from 121.6 mA/cm2 to 124.9 mA/cm2, and the open circuit voltage (Voc) is found to be unrelated to the complex concentration in the films. The fill factor (FF) remains constant with the Eu concentration. The EQE curves indicate an enhancement in the performance of the photovoltaic cells within the UV region of the spectrum for all coated devices. Electrochemical impedance spectroscopy (EIS) was also carried out in order to analyze the effect of the Eu complex in the charge transfer process of the devices.

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