Fluorescence properties of Mn4+ in CaAl12O19 compounds as red-emitting phosphor for white LED

Murata, Takahiro; Tanoue, Takeshi; Iwasaki, Mineto; Morinaga, Kenji; Hase, T.

doi:10.1016/j.jlumin.2005.01.003

Cited by 227 publications

(122 citation statements)

References 8 publications

Supporting

Mentioning

108

Contrasting

Order By: Relevance

“…uniformly occupies the Al 3? sites of octahedra, AlO 6 , rather than AlO 4 in all above aluminates according to several references (e.g., [11]), the strong crystal field of six oxygen ions might play a key role for Mn 4? to yield high-efficient red emission.…”

Section: Introductionmentioning

confidence: 92%

Luminescent properties of La2LiTaO6:Mn4+ and its application as red emission LEDs phosphor

Wang

Yuan

et al. 2014

Appl. Phys. A

View full text Add to dashboard Cite

A novel phosphor, Mn 4? doped La 2 LiTaO 6 , was developed by solid-state reaction method. The luminescent spectra and emission efficiencies of La 2 LiTaO 6 :-Mn x 4? (x = 0.001, 0.003, 0.005 and 0.01) were discussed. The effects of co-doped charge compensation ions, M = Mg 2? , Ca 2? , Na ? , were investigated, respectively. The excitation spectra indicated that La 2 LiTaO 6 :Mn 4? could be effectively excited by both NUV light and blue light. The emission spectra of the phosphor exhibit a broadband ranging from 670 to 720 nm with the maximum at about 709 nm in deep red region. The co-doping of Mg 2? could significantly improve the luminescent properties of La 2 LiTaO 6 :Mn 4? . Thus, phosphor La 2 LiTaO 6 :-Mn 4? , Mg 2? can serve as a key component to improve color rendering of blue-chip white-LEDs.

show abstract

Section: Introductionmentioning

confidence: 92%

Luminescent properties of La2LiTaO6:Mn4+ and its application as red emission LEDs phosphor

Wang

Yuan

et al. 2014

Appl. Phys. A

View full text Add to dashboard Cite

show abstract

“…9,21 So far, the closest emitting state to * Electrochemical Society Member. z E-mail: t.jansen@fh-muenster.de; tj@fh-muenster.de 630 nm in oxide based materials was observed for Mg 14 22,23 PL properties of several other Mn 4+ doped phosphors, such as germanates, arsenates, gallates, and other complex oxides, have been studied and results published so far. [24][25][26] Accordingly, research activity and commercial interest is highly focused on Mn 4+ based phosphors presently.…”

mentioning

confidence: 99%

Narrow Band Deep Red Photoluminescence of Y₂Mg₃Ge₃O₁₂:Mn⁴⁺,Li⁺Inverse Garnet for High Power Phosphor Converted LEDs

Jansen

Gorobez

Kirm

et al. 2017

ECS J. Solid State Sci. Technol.

View full text Add to dashboard Cite

This work concerns a novel red emitting Mn 4+ doped phosphor showing an extraordinarily high thermal quenching temperature. The composition Y 2 Mg 3 Ge 3 O 12 :Mn 4+ ,Li + exhibits efficient red photoluminescence peaking at 658 nm, which can be assigned to the 2 E g → 4 A 2g intraconfigurational transition of Mn 4+ ([Ar]3d 3 configuration) located at the octahedral site in the garnet structure. Photoluminescence properties, such as temperature dependence of the luminescence intensity and luminescence lifetime are presented. Additionally, the band structure of the undoped host material were treated with Density Functional Theory (DFT) and evaluated with UV-reflectance spectroscopy. [1][2][3][4][5] However, this approach suffers from major shortcomings such as cold white light and a low color rendering index (CRI), which results from the lack of red light. Therefore, red phosphors with outstanding luminescent performance and strong absorption in the near UV to blue spectral range are highly demanded. Compared with the established commercial red phosphors, for example, (Ca,Sr)AlSiN 3 :Eu 2+ and (Ca,Sr,Ba) 2 Si 5 N 8 :Eu 2+ , which typically possess a broad emission band, Mn 4+ activated oxide and fluoride phosphors exhibit an emission spectrum consisting of narrow lines in the red region.6-14 Moreover, the preparation of nitride phosphors requires harsh conditions, i.e. high temperature and pressure, which to a tremendous extent, increase the cost and difficulty of preparation. 15,16 Additionally, rare earth elements as raw materials are too expensive for producing respective phosphors at a low cost-price. Recently, Mn 4+ doped fluoride red emitting phosphors have attracted much attention because of the simple and efficient fabrication process, i.e. they can be prepared at room temperature or slightly above (20-80• C) by cation exchange reaction. 17 However, these types of materials have a huge drawback because toxic hydrofluoric acid is needed for their synthesis. Additionally, Mn 4+ doped fluorides are rather sensitive toward high temperature, high humidity, and large excitation densities provided by LEDs. [18][19][20] In general, Mn 4+ doped oxide phosphors were prepared using conventional oxides, nitrates, and perchlorates as starting materials. All these disadvantages could be overcome by using an oxide type host material, if one is able to find a Mn 4+ doped oxide host with a rather narrow emission band peaking at approximately 630 nm. 24-26 Accordingly, research activity and commercial interest is highly focused on Mn 4+ based phosphors presently. These type of materials can emit in the desired red spectral region with a high quantum yield and thus meet the efficiency and color quality demands of the next generation warm white pcLEDs. It is well known, that the Mg 14 Ge 5 O 24 :Mn 4+ phosphor (also known as Mg-fluorogermanate due to the presence of some MgF 2 as a flux) has extraordinary good properties in terms of the thermal quenching of the luminescence (T 1/2 > 700 K).27 Due to this circumstance, the au...

show abstract

“…It has been reported that Mn 2+ ions generate in the red phosphor Mn 4+ doped CaAl12O19 due to electroneutrality [1]. The intensity of red fluorescence have been reported to be improved through increase in amount of Mn Relation between the maximum fluorescence intensity and the nominal composition x is shown in Fig.…”

Section: Optical and Fluorescence Propertiesmentioning

confidence: 86%

“…Recently, Murata et al developed a red phosphor, CaAl12O19:Mn, for the white LEDs [1]. Tetravalent manganese ions occupied on six-coordinated Al 3+ sites are thought to be light-emitting ions.…”

Section: Introductionmentioning

confidence: 99%

New Red Phosphors Ca14Al10Zn6O35 : Mn

Sada

Saitoh

Takemoto

2014

Trans. Mat. Res. Soc. Japan

View full text Add to dashboard Cite

New red phosphors with nominal composition of Ca 14 (Al 10-x Mn x )Zn 6 O 35 were synthesized successfully. The composition x at which the highest fluorescent intensity was obtained was found to be 0.09. The manganese ions were determined to be tetravalent and six-coordinated in the samples by analyses of optical absorption spectra and fluorescence spectra. These samples emit red fluorescence without most changes in chromaticity up to 200 o C with increasing temperature, though the fluorescence intensity decreased.

show abstract

Fluorescence properties of Mn4+ in CaAl12O19 compounds as red-emitting phosphor for white LED

Cited by 227 publications

References 8 publications

Luminescent properties of La2LiTaO6:Mn4+ and its application as red emission LEDs phosphor

Luminescent properties of La2LiTaO6:Mn4+ and its application as red emission LEDs phosphor

Narrow Band Deep Red Photoluminescence of Y₂Mg₃Ge₃O₁₂:Mn⁴⁺,Li⁺Inverse Garnet for High Power Phosphor Converted LEDs

New Red Phosphors Ca<sub>14</sub>Al<sub>10</sub>Zn<sub>6</sub>O<sub>35</sub> : Mn

Contact Info

Product

Resources

About

Fluorescence properties of Mn4+ in CaAl12O19 compounds as red-emitting phosphor for white LED

Cited by 227 publications

References 8 publications

Luminescent properties of La2LiTaO6:Mn4+ and its application as red emission LEDs phosphor

Luminescent properties of La2LiTaO6:Mn4+ and its application as red emission LEDs phosphor

Narrow Band Deep Red Photoluminescence of Y2Mg3Ge3O12:Mn4+,Li+Inverse Garnet for High Power Phosphor Converted LEDs

New Red Phosphors Ca<sub>14</sub>Al<sub>10</sub>Zn<sub>6</sub>O<sub>35</sub> : Mn

Contact Info

Product

Resources

About

Narrow Band Deep Red Photoluminescence of Y₂Mg₃Ge₃O₁₂:Mn⁴⁺,Li⁺Inverse Garnet for High Power Phosphor Converted LEDs