Luminescence of Eu2+ in silicate host lattices with alkaline earth ions in a row

Poort, S. H. M.; Reijnhoudt, H. M.; Kuip, H. O. T. Van Der; Blasse, G.

doi:10.1016/0925-8388(96)02324-9

Cited by 240 publications

(155 citation statements)

References 21 publications

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“…Eu 2 + luminescence is usually due to 4f 6 5d-4f 7 interconfigurational transitions, which lead to a rather broad emission whose spectral position depends strongly on the chemical nature of the crystal. The maximum of the Eu 2 + 4f 6 5d-4f 7 [20,21]. In all the cases the emission bands are broad and the corresponding Stokes shifts are very large, ranging from $ 7500 cm À 1 for BaSiO 3 :Eu 2 + , Sr 2 LiSiO 4 F:Eu 2 + and up to 12,000 cm À 1 for Ba 2 Mg(BO 3 ) 2 :Eu 2 + .…”

Section: Discussionmentioning

confidence: 87%

“…In all the cases the emission bands are broad and the corresponding Stokes shifts are very large, ranging from $ 7500 cm À 1 for BaSiO 3 :Eu 2 + , Sr 2 LiSiO 4 F:Eu 2 + and up to 12,000 cm À 1 for Ba 2 Mg(BO 3 ) 2 :Eu 2 + . Poort et al [20,21] and later Dorenbos [22] pointed out that these long-wavelength emissions are possibly not related to the 4f 6 5d-4f 7 transitions of Eu 2 + ions, but may be due to an absolutely different process, namely radiative decay of an impurity trapped exciton. This interpretation implies that excitation into the Eu 2 + 4f 7 -4f 6 5d bands leads to ionization of Eu 2 + ions and the formation of an exciton-like state, which consists of a bound electron hole pair with the hole localized on the Eu 3 + ion and the electron delocalized on the nearest-neighbor cations.…”

Section: Discussionmentioning

confidence: 99%

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Luminescent properties of Eu2+ and Ce3+ ions in strontium litho-silicate Li2SrSiO4

Dotsenko¹,

Levshov²,

Berezovskaya³

et al. 2011

Journal of Luminescence

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a b s t r a c tThe luminescent properties of Eu 2 + and Ce 3 + ions in Li 2 SrSiO 4 have been studied upon excitation in the 2-20 eV region. Based on the results of luminescent measurements, values of the crystal field splitting and the centroid shift of the Ce 3 + 5d configuration in Li 2 SrSiO 4 were found and compared with those of Ce 3 + ions in some other inorganic compounds. The Eu 2 + ions in Li 2 SrSiO 4 exhibit a broad band emission with a maximum at 576 nm, which is due to the 4f 6 5d-4f 7 transition. It was shown that the long-wavelength position of the Eu 2 + emission in Li 2 SrSiO 4 is caused by the large crystal-field splitting of the Eu 2 + 4f 6 5d configuration and relatively high degree of covalency of the Eu-O bond. The stabilization of Eu 2 + ions in Li 2 SrSiO 4 during the synthesis process requires a strong reducing agent. Two phenomenological approaches to explain the low stability of Eu 2 + in Li 2 SrSiO 4 are also discussed.

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Section: Discussionmentioning

confidence: 87%

Section: Discussionmentioning

confidence: 99%

Luminescent properties of Eu2+ and Ce3+ ions in strontium litho-silicate Li2SrSiO4

Dotsenko¹,

Levshov²,

Berezovskaya³

et al. 2011

Journal of Luminescence

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“…The spectral position of the zero phonon line was taken to be the point of intersection of absorption and emission spectrum, l 0À0 ¼ 494 nm (2.51 eV). This yields a value of 0.42 eV for SS, which is a typical value for the fd emission from Eu 2+ [20,21]. For example, in aluminates, silicates and phosphate host lattices, SSs are reported between 0.25 and 1 eV for fd emission from Eu 2+ [20,21].…”

Section: Crystal Structurementioning

confidence: 92%

“…One of a few exceptions is (Ba,Sr) 2 SiO 4 :Eu 2+ which emits in the green to yellow spectral range, viz. 520-580 nm [21]. The shift of the emission to a longer wavelength is ascribed to a higher degree of covalency between the activator ion and its surroundings (nephelauxetic effect) [25].…”

Section: Crystal Structurementioning

confidence: 99%

“…This yields a value of 0.42 eV for SS, which is a typical value for the fd emission from Eu 2+ [20,21]. For example, in aluminates, silicates and phosphate host lattices, SSs are reported between 0.25 and 1 eV for fd emission from Eu 2+ [20,21]. The fullwidth at half-maximum (FWHM) of the emission band is 0.3 eV, and is slightly smaller than the FWHM as is commonly observed for Eu 2+ fd emission [22].…”

Section: Crystal Structurementioning

confidence: 99%

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Luminescence properties of SrSi2O2N2 doped with divalent rare earth ions

Bachmann

Jüstel

Meijerink

et al. 2006

Journal of Luminescence

222

158

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The optical properties of SrSi 2 O 2 N 2 doped with divalent Eu 2+ and Yb 2+ are investigated. The Eu 2+ doped material shows efficient green emission peaking at around 540 nm that is consistent with 4f 7 -4f 6 5d transitions of Eu 2+ . Due to the high quantum yield (90%) and high quenching temperature (4500 K) of luminescence, SrSi 2 O 2 N 2 :Eu 2+ is a promising material for application in phosphor conversion LEDs. The Yb 2+ luminescence is markedly different from Eu 2+ and is characterized by a larger Stokes shift and a lower quenching temperature. The anomalous luminescence properties are ascribed to impurity trapped exciton emission. Based on temperature and time dependent luminescence measurements, a schematic energy level diagram is derived for both Eu 2+ and Yb 2+ relative to the valence and conduction bands of the oxonitridosilicate host material. r

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Site‐Selective Occupancy of Eu²⁺ toward High Luminescence Switching Contrast in BaMgSiO₄‐Based Photochromic Materials

Zhu

Sun

Jia

et al. 2021

Advanced Optical Materials

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Luminescent inorganic photochromics have great potential applications in 3D optical memory due to their excellent thermal stability and chemical resistance. Nevertheless, constructing inorganic photochromics with a high luminescence switching contrast remains challenging for optical information storage. Understanding inherent relationships between microenvironment changes, photophysical material properties, and rational control of their luminescence properties are crucial to address these issues. This paper proposes an effective strategy to significantly improve the luminescence switching contrast by more than 300% by site‐selective occupancy engineering on BaMgSiO4:Eu2+ photochromic materials. An effective energy transfer process is established between luminescent and photochromic units, which may provide new insights for designing high‐performance optical storage systems. The fabricated flexible films exhibit excellent waterproof, flexibility, and stretchability characteristics, accompanied by reversible color switching and larger color contrast. Optical data storage can be not only visually encoded and decoded on the flexible films by 405 and 532 nm LED excitation, respectively. Writing, erasing, and reading strategies for flexible films are particularly suitable for complex application environments in optical storage and rewritable flexible devices.

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Luminescence of Eu2+ in silicate host lattices with alkaline earth ions in a row

Cited by 240 publications

References 21 publications

Luminescent properties of Eu2+ and Ce3+ ions in strontium litho-silicate Li2SrSiO4

Luminescent properties of Eu2+ and Ce3+ ions in strontium litho-silicate Li2SrSiO4

Luminescence properties of SrSi2O2N2 doped with divalent rare earth ions

Site‐Selective Occupancy of Eu²⁺ toward High Luminescence Switching Contrast in BaMgSiO₄‐Based Photochromic Materials

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Luminescence of Eu2+ in silicate host lattices with alkaline earth ions in a row

Cited by 240 publications

References 21 publications

Luminescent properties of Eu2+ and Ce3+ ions in strontium litho-silicate Li2SrSiO4

Luminescent properties of Eu2+ and Ce3+ ions in strontium litho-silicate Li2SrSiO4

Luminescence properties of SrSi2O2N2 doped with divalent rare earth ions

Site‐Selective Occupancy of Eu2+ toward High Luminescence Switching Contrast in BaMgSiO4‐Based Photochromic Materials

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Site‐Selective Occupancy of Eu²⁺ toward High Luminescence Switching Contrast in BaMgSiO₄‐Based Photochromic Materials