OPTICAL ABSORPTION SPECTRUM OF EXCITED Cr<sup>3+</sup>IONS IN YTTRIUM ALUMINUM GARNET

Sevast'yanov, B. K.; Sviridov, D. T.; Orekhova, V. P.; Pasternak, L B; Sviridova, R. K.; Veremeichik, T. F.

doi:10.1070/qe1973v002n04abeh004456

Cited by 13 publications

(12 citation statements)

References 1 publication

(1 reference statement)

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“…5 shows typical excitation and emission spectra in the system Y 3 Al 5 À y O 12 :yCr 3 + , which are in reasonable accordance with the single crystal data reported in Ref. [5]. The features of the spectra are quite similar to those of Al 2 O 3 :Cr 3 + , in which Cr 3 + replaces Al at octahedral site, thus the spectra can be understood by the Tanabe-Sugano diagram for d 3 configuration in octahedron [6].…”

Section: Luminescent Properties Of Ce 3 + or Cr 3 + Singly Doped Y 3 supporting

confidence: 87%

“…At this stage, we cannot give firm assignments for the weak emission peaks at 671, 706 and 723 nm. Sevast'yanov et al indicated that these emissions were from electron-vibrational transitions [5]. Accurate analysis was conducted, indicating that the sharp line emission at 693 nm was from the minor impurity phase Al 2 O 3 :Cr 3 + .…”

Section: Luminescent Properties Of Ce 3 + or Cr 3 + Singly Doped Y 3 mentioning

confidence: 99%

“…If inorganic materials with efficient far-red and near-infrared emissions are developed, the stability of the LSCs will be improved, which will be significant to enhance the efficiency of Si-SCs. Previous research showed that Cr 3+ doped single crystal Y 3 Al 5 O 12 has two major absorption peaks at $ 430 and $ 600 nm; at room temperature this material gives two strong luminescence lines at 688.7 and 687.7 nm, which were called R 1 and R 2 lines [5,6]. However, since the absorption of Cr 3+ originates from the d-d forbidden transition, its excitation efficiency is not very satisfied.…”

Section: Introductionmentioning

confidence: 98%

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Energy transfer and luminescent properties of Ce3+, Cr3+ co-doped Y3Al5O12

Shao

Jing

2011

Journal of Luminescence

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Section: Luminescent Properties Of Ce 3 + or Cr 3 + Singly Doped Y 3 supporting

confidence: 87%

Section: Luminescent Properties Of Ce 3 + or Cr 3 + Singly Doped Y 3 mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

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Energy transfer and luminescent properties of Ce3+, Cr3+ co-doped Y3Al5O12

Shao

Jing

2011

Journal of Luminescence

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“…Figure 4 shows the PLE and PL spectra of a selected Cr 3þ singly doped sample MgSrAl 9.95 O 17 :0.05Cr 3þ . The features of the spectra are quite similar to those of Al 2 O 3 :Cr 3þ , 12 in which Cr 3þ replaces Al at octahedral site, thus the spectra of MgSrAl 9.95 O 17 :0.05Cr 3þ z E-mail: xiazg@cugb.edu.cn; xpjing@pku.edu.cn can be understood by the Tanabe-Sugano diagram for d 3 configuration in octahedron. 6 Under excitation at 400 and 560 nm, the emissions of Cr 3þ are observed in the deep-red region.…”

Section: Resultsmentioning

confidence: 86%

Photoluminescence and Energy Transfer of Eu2+, Cr3+ Co-Doped MgSrAl10O17

Shao

Zhao

Xia

et al. 2011

J. Electrochem. Soc.

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Eu 2þ or Cr 3þ singly doped and Eu 2þ -Cr 3þ co-doped MgSrAl 10 O 17 luminescent materials were synthesized by solid-state reactions and their photoluminescence properties were investigated. These luminescent materials have absorption in the UV-Vis region and give luminescence in the deep-red region ($693 nm), which are suitably applied in a device of luminescent solar concentrator (LSC) for improving the efficiency of silicon solar cells. In these luminescent materials, Eu 2þ located at Sr 2þ site can effectively transfer its absorbed energy to Cr 3þ at Al 3þ site. The energy transfer from Eu 2þ to Cr 3þ takes the dipole-dipole interaction mechanism. The transfer efficiency (g ET ) approaches about 0.63 and the optimized quantum efficiency (QE) for Cr 3þ emission is about 11%.Over past tens years, many attentions have been paid to the development of solar cells as promising devices for inexpensive and large-scale solar energy conversion. The efficiency in the commercial Si solar cells is just about 15%, which means that most of sunlight energy (over 70%) is lost. 1-3 The main energy loss for these cells in the conversion of solar energy to electricity is related to the so-called spectral mismatch between incident solar photon energies and the energy gap (E g ) of the cells. 4 As we know, the main energy of the solar emission dispersing on the earth surface is in visible light region, but E g of the Si cell ($1.1 eV) is suitable for the absorption in deep-red and near-infrared region.Nowadays, luminescent solar concentrator (LSC) has attracted research interest worldwide. LSC is a kind of unique and efficient device that can collect solar photons and transfer them to the photons matching E g of the Si solar cells. A typical LSC is constructed by a transparent waveguide plate coated with a luminescent material film and the Si solar cells are closely mounted at the edges of the plate. When luminescent materials with efficient UV-Vis absorption and deep-red and near-infrared emissions are applied in LSCs, the efficiency of Si cells would be significantly enhanced. Recently, Michael J. Currie et al. 5 reported a LSC constructed by organic luminescent materials. Normally, organic luminescent materials have high efficiency, but their stability is doubtable. If inorganic materials with efficient far-red and near-infrared emissions are developed, the stability of the LSCs will be improved, which will be significantly to enhance the efficiency of Si cells.As we know, Cr 3þ with red emission is one of the most used activators in laser crystals. 6 Recently, Ruixia Zhong et al. have reported the efficient energy transfer from Eu 2þ to Cr 3þ in Sr 4 Al 14 O 25 , 7 SrAl 12 O 19 nano-rods 8 and Sr 3 Al 10 SiO 20 -SrAl 12 O 19 mixed phases 9 , which were reportedly to be used for illumination and display. It may be deduced that Eu 2þ ÀCr 3þ co-doped luminescent materials may be used in LSC. In this paper, we report the photoluminescence characteristics of Eu 2þ or Cr 3þ singly doped and Eu 2þ ÀCr 3þ co-doped MgSrAl 12 O 19 and t...

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“…[ 12 ] For previously reported Cr 3+ activated garnet phosphors, there are two major drawbacks to be resolved: one is the low absorption efficiency (AE) of Cr 3+ in the high‐symmetry octahedral sites of those garnet hosts; another is the reduced IQE when λ em,max > 800 nm. [ 6,13 ] Here, we report a new broadband NIR garnet phosphor Lu 2 CaMg 2 Ge 3 O 12 :Cr 3+ (LCMG:Cr 3+ ), where the cation disordering in the dodecahedral sites allows for octahedrally coordinated Cr 3+ without the inversion symmetry to achieve high AE and concentration‐dependent PL properties. Furthermore, we demonstrate that the introduction of Yb 3+ into LCMG:Cr 3+ not only substantially increases the overall FWHM from 152 to 262 nm, but also simultaneously improves the IQE and thermal stability.…”

Section: Introductionmentioning

confidence: 99%

Efficient, Stable, and Ultra‐Broadband Near‐Infrared Garnet Phosphors for Miniaturized Optical Applications

Dumesso

Xiao

Zheng

et al. 2022

Advanced Optical Materials

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a rapid development and now become the preferred white light sources for general illumination and backlight display. [1] Near-infrared (NIR) pc-LEDs were accordingly proposed as a new-generation light source to circumvent the limitations of the application of conventional counterparts like NIR semiconductor LEDs, supercontinuum lasers and halogen lamps to compact optical systems. [2] Especially, NIR pc-LEDs covering a wide spectral range of 700-1100 nm, when coupled with Si-based photodetectors, can miniaturize NIR spectroscopy to be an integrated module for mobile phones and smart wearables, thereby realizing instant identification of food, clothing and pharmaceuticals, and real-time monitoring of human health. [3] However, the spectral properties and optical output power of NIR pc-LEDs are still far from practical application for the lack of satisfactory NIR phosphors.Phosphors play a key role in the conversion of narrowband blue light from LED chips to the desired broadband NIR one. Over the past few years significant effort has been devoted to exploiting a variety of ions including Cr 3+ , [4][5][6][7] Mn 2+ , [8] and Eu 2+[9] as the broadband NIR emitters, but only Cr 3+ has hitherto exhibited high internal quantum efficiency (IQE) and good photoluminescence (PL) thermal stability in a handful of host crystals, such as Gd 3 Sc 1.

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OPTICAL ABSORPTION SPECTRUM OF EXCITED Cr³⁺IONS IN YTTRIUM ALUMINUM GARNET

Cited by 13 publications

References 1 publication

Energy transfer and luminescent properties of Ce3+, Cr3+ co-doped Y3Al5O12

Energy transfer and luminescent properties of Ce3+, Cr3+ co-doped Y3Al5O12

Photoluminescence and Energy Transfer of Eu2+, Cr3+ Co-Doped MgSrAl10O17

Efficient, Stable, and Ultra‐Broadband Near‐Infrared Garnet Phosphors for Miniaturized Optical Applications

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OPTICAL ABSORPTION SPECTRUM OF EXCITED Cr3+IONS IN YTTRIUM ALUMINUM GARNET

Cited by 13 publications

References 1 publication

Energy transfer and luminescent properties of Ce3+, Cr3+ co-doped Y3Al5O12

Energy transfer and luminescent properties of Ce3+, Cr3+ co-doped Y3Al5O12

Photoluminescence and Energy Transfer of Eu2+, Cr3+ Co-Doped MgSrAl10O17

Efficient, Stable, and Ultra‐Broadband Near‐Infrared Garnet Phosphors for Miniaturized Optical Applications

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OPTICAL ABSORPTION SPECTRUM OF EXCITED Cr³⁺IONS IN YTTRIUM ALUMINUM GARNET