Electronic, structural, and optical properties of host materials for inorganic phosphors

Alemany, Pere; Moreira, Ibério de P. R.; Castillo, Rodrigo; Llanos, Jaime

doi:10.1016/j.jallcom.2011.11.036

Cited by 26 publications

(16 citation statements)

References 66 publications

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“…For rare-earth oxysulfides, one may expect large centroid shifts when compared to their corresponding oxides. It is important to note that rare-earth oxysulfides with small bandgaps are subject to luminescence quenching since the f or d orbitals of a given dopant may rest at the energy levels below the valence band maximum or above the conduction band minimum …”

Section: Design Criteria Of Lanthanide-activated Phosphorsmentioning

confidence: 94%

Lanthanide-Activated Phosphors Based on 4f-5d Optical Transitions: Theoretical and Experimental Aspects

et al. 2017

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The synthesis of lanthanide-activated phosphors is pertinent to many emerging applications, ranging from high-resolution luminescence imaging to next-generation volumetric full-color display. In particular, the optical processes governed by the 4f-5d transitions of divalent and trivalent lanthanides have been the key to enabling precisely tuned color emission. The fundamental importance of lanthanide-activated phosphors for the physical and biomedical sciences has led to rapid development of novel synthetic methodologies and relevant tools that allow for probing the dynamics of energy transfer processes. Here, we review recent progress in developing methods for preparing lanthanide-activated phosphors, especially those featuring 4f-5d optical transitions. Particular attention will be devoted to two widely studied dopants, Ce and Eu. The nature of the 4f-5d transition is examined by combining phenomenological theories with quantum mechanical calculations. An emphasis is placed on the correlation of host crystal structures with the 5d-4f luminescence characteristics of lanthanides, including quantum yield, emission color, decay rate, and thermal quenching behavior. Several parameters, namely Debye temperature and dielectric constant of the host crystal, geometrical structure of coordination polyhedron around the luminescent center, and the accurate energies of 4f and 5d levels, as well as the position of 4f and 5d levels relative to the valence and conduction bands of the hosts, are addressed as basic criteria for high-throughput computational design of lanthanide-activated phosphors.

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Section: Design Criteria Of Lanthanide-activated Phosphorsmentioning

confidence: 94%

Lanthanide-Activated Phosphors Based on 4f-5d Optical Transitions: Theoretical and Experimental Aspects

et al. 2017

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“…This paper is part of our continuing research on the synthesis, applications, characterization and luminescent properties of inorganic phosphors containing rare-earth cations [13][14][15][16]. In this report, we focused on the preparation of Eu 3+ -doped Y 2 W0 6 and its application in photoelectrodes (PE) in DSSCs in order to investigate the possibility of increasing the spectral response of DSSCS using down-shifting luminescent materials.…”

Section: Introductionmentioning

confidence: 99%

A down-shifting Eu ³⁺ -doped Y ₂ WO ₆ /TiO ₂ photoelectrode for improved light harvesting in dye-sensitized solar cells

et al. 2018

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Y1.86Eu0.14WO6 phosphors were prepared using a solid-state reaction method. Their optical properties were analysed, and they was mixed with TiO2, sintered, and used as a photoelectrode (PE) in dye-sensitized solar cells (DSSCs). The as-prepared photoelectrode was characterized by photoluminescence spectroscopy, diffuse reflectance, electrochemical impedance spectroscopy (EIS) and X-ray diffraction. The photoelectric conversion efficiency of the DSSC with TiO2:Y1.86Eu0.14WO6 (100:2.5) was 25.8% higher than that of a DSCC using pure TiO2 as PE. This high efficiency is due to the ability of the luminescent material to convert ultraviolet radiation from the sun to visible radiation, thus improving the solar light harvesting of the DSSC.

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“…There have been extensive studies on new phosphors for W-LEDs [3][4][5][6][7][8][9][10]. In particular Eu 3+ -doped oxyacid materials such as tungstates [11], silicates [14], vanadates [15], borates [16] and phosphates [11][12][13][14][15][16][17] have been investigated for red emitting phosphors.…”

Section: Introductionmentioning

confidence: 99%

The thermal stability and structural site-distribution of Eu3+ ions in the red-emitting phosphors Ca9Eu2W4O24 and Sr9Eu2W4O24

Qin

Huang

Seo

2012

Journal of Alloys and Compounds

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Electronic, structural, and optical properties of host materials for inorganic phosphors

Cited by 26 publications

References 66 publications

Lanthanide-Activated Phosphors Based on 4f-5d Optical Transitions: Theoretical and Experimental Aspects

Lanthanide-Activated Phosphors Based on 4f-5d Optical Transitions: Theoretical and Experimental Aspects

A down-shifting Eu ³⁺ -doped Y ₂ WO ₆ /TiO ₂ photoelectrode for improved light harvesting in dye-sensitized solar cells

The thermal stability and structural site-distribution of Eu3+ ions in the red-emitting phosphors Ca9Eu2W4O24 and Sr9Eu2W4O24

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Electronic, structural, and optical properties of host materials for inorganic phosphors

Cited by 26 publications

References 66 publications

Lanthanide-Activated Phosphors Based on 4f-5d Optical Transitions: Theoretical and Experimental Aspects

Lanthanide-Activated Phosphors Based on 4f-5d Optical Transitions: Theoretical and Experimental Aspects

A down-shifting Eu 3+ -doped Y 2 WO 6 /TiO 2 photoelectrode for improved light harvesting in dye-sensitized solar cells

The thermal stability and structural site-distribution of Eu3+ ions in the red-emitting phosphors Ca9Eu2W4O24 and Sr9Eu2W4O24

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A down-shifting Eu ³⁺ -doped Y ₂ WO ₆ /TiO ₂ photoelectrode for improved light harvesting in dye-sensitized solar cells