The different luminescent characteristics of MgAl2O4:Mn2+ between phosphor powder and nanoparticles

Zhong, Rui; Zhang, Jiahua; Wei, Hanzhi; Qi, Xiwei; Li, Mingya; Han, Xiumei

doi:10.1016/j.cplett.2011.04.033

Cited by 33 publications

(14 citation statements)

References 15 publications

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“…Figure a provides the room temperature emission spectra of Mg 1– x Mn x Al 2 O 4 ( x = 0.01–1.0) upon 450 nm blue‐light excitation. When the doping concentration of Mn 2+ is x < 0.10, the emission spectra of the samples consist of a visible (VIS) emission band centered at ≈525 nm with an FWHM of ≈35 nm, corresponding to the 4 T 1 ( 4 G) → 6 A 1 ( 6 S) transition of Mn 2+ . While, as the doping concentration increases to x = 0.10 or above, an extra NIR emission band centered at ≈825 nm with a FWHM of ≈125 nm appears except for the VIS emission.…”

Section: Resultsmentioning

confidence: 99%

Heavy Mn²⁺ Doped MgAl₂O₄ Phosphor for High‐Efficient Near‐Infrared Light‐Emitting Diode and the Night‐Vision Application

Song

Jiang

Zhou

et al. 2019

Advanced Optical Materials

205

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Photoluminescence originated from doped activators in the solid state materials usually faces the challenge of concentration quenching, restricting the further increase of photoluminescence intensity. Herein, a new strategy is demonstrated by the heavy doping Mn2+ into MgAl2O4, leading to the broad‐band near‐infrared (NIR) emission peaking at ≈825 nm with a full width at half maximum of ≈125 nm, as well as high internal quantum efficiency of ≈53% upon 450 nm laser excitation. Density functional theory calculation and extend X‐ray absorption fine structure provide a understanding of Al3+/Mn2+ disorder and Mn2+–Mn2+ aggregation in spinel Mg1–xAl2O4:xMn2+ with high Mn2+ content, which enables the formation of superexchange coupled IVMn2+–VIMn2+ pair. The NIR light‐emitting diodes fabricated by the 450 nm blue chip and Mg0.50Al2O4:0.50Mn2+ phosphor gives a high NIR output power of ≈78.41 mW under a driven current of 120 mA, and night‐vision application as light source in the dark is demonstrated. This work opens new paths for rational design of efficient broad‐band NIR emitting phosphor, and also provides new insights into the Mn2+ luminescence and the applications.

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Section: Resultsmentioning

confidence: 99%

Heavy Mn²⁺ Doped MgAl₂O₄ Phosphor for High‐Efficient Near‐Infrared Light‐Emitting Diode and the Night‐Vision Application

Song

Jiang

Zhou

et al. 2019

Advanced Optical Materials

205

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“…On the other hand, Mg 2+ ions in NCMP provide appropriately-sized and charge-balanced substituted lattice sites with Mn 2+ similar to other Mn 2+ -doped phosphors including MgGeO 3 : Mn 2+ , 24 CaMgGe 2 O 6 :Mn 2+ , 25 KMg(PO 3 ) 3 :Mn 2+ , 26 and MgAl 2 O 4 : Mn 2+ . 27 In this work, we took NCMP as the host material and doped Eu and Mn into it to prepare phosphors. We envision that the Mg 2+ ion in this structure is suitable to be substituted by Mn 2+ , whereas the Na + site is more suitable for Eu 2+ .…”

Section: Introductionmentioning

confidence: 99%

A new type of phosphate-based phosphor Na₃CsMg₇(PO₄)₆:Eu²⁺/Mn²⁺with high quantum efficiency and high thermostability

et al. 2022

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“…[1][2][3][4][5] Titanium-doped MgAl 2 O 4 provides a promising phosphor for light emitting diodes (LEDs). [1][2][3][4][5] Titanium-doped MgAl 2 O 4 provides a promising phosphor for light emitting diodes (LEDs).…”

Section: Introductionmentioning

confidence: 99%

“…MgAl 2 O 4 has long been investigated in various fields of material science owing to its excellent thermal, mechanical and chemical properties, and stability, and has recently been evaluated as a host material of photoluminescence with the embedment of transition metals or rare earth elements as an activation center. [1][2][3][4][5] Titanium-doped MgAl 2 O 4 provides a promising phosphor for light emitting diodes (LEDs). [6][7][8][9][10] On the other hand, the oxidation state and position of Ti in the MgAl 2 O 4 crystal remain controversial, and different emission colors have been reported.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic investigation of Ti doping in MgAl₂O₄ based on the first-principles method

2015

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Ti doping of MgAl 2 O 4 crystals is investigated using a theoretical thermodynamic approach. A number of types of Ti-doped MgAl 2 O 4 are produced by combining possible Ti oxidation states (Ti 2+ , Ti 3+ , Ti 4+ ), doping sites (Al and Mg sites), and additional point defects (antisites, vacancies). Crystal models containing each doping type are prepared, and by treating them as independent phases, phase diagrams of the Mg-Al-Ti-O system are simulated based on first-principles. This enables study of stable doping types as functions of synthesis conditions and chemical compositions. In air or H 2 conditions, only the Ti ୪ • + Mg ୪ ᇱ type is stable on the phase diagram, whereas Ti ୪ × and Ti ୪ • + Mg ୪ ᇱ appears to be stable in strongly reducing CO/CO 2 atmosphere at high temperatures. A quantitative analysis model is established for calculating the fractions of certain doping types based on considerations of formation energy and mixing entropy, and the proportions of doping types are calculated. Changes in Ti 3+ : Ti 4+ ratio are simulated, and the effects of temperature, oxygen partial pressure, Mg/Al ratio, and surface are examined. The results obtained show good agreement with XPS results and photoluminescence measurements. The study provides a guide to the design and property tuning of Tidoped MgAl 2 O 4 phosphors for LED-applications.

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The different luminescent characteristics of MgAl2O4:Mn2+ between phosphor powder and nanoparticles

Cited by 33 publications

References 15 publications

Heavy Mn²⁺ Doped MgAl₂O₄ Phosphor for High‐Efficient Near‐Infrared Light‐Emitting Diode and the Night‐Vision Application

Heavy Mn²⁺ Doped MgAl₂O₄ Phosphor for High‐Efficient Near‐Infrared Light‐Emitting Diode and the Night‐Vision Application

A new type of phosphate-based phosphor Na₃CsMg₇(PO₄)₆:Eu²⁺/Mn²⁺with high quantum efficiency and high thermostability

Thermodynamic investigation of Ti doping in MgAl₂O₄ based on the first-principles method

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The different luminescent characteristics of MgAl2O4:Mn2+ between phosphor powder and nanoparticles

Cited by 33 publications

References 15 publications

Heavy Mn2+ Doped MgAl2O4 Phosphor for High‐Efficient Near‐Infrared Light‐Emitting Diode and the Night‐Vision Application

Heavy Mn2+ Doped MgAl2O4 Phosphor for High‐Efficient Near‐Infrared Light‐Emitting Diode and the Night‐Vision Application

A new type of phosphate-based phosphor Na3CsMg7(PO4)6:Eu2+/Mn2+with high quantum efficiency and high thermostability

Thermodynamic investigation of Ti doping in MgAl2O4 based on the first-principles method

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Heavy Mn²⁺ Doped MgAl₂O₄ Phosphor for High‐Efficient Near‐Infrared Light‐Emitting Diode and the Night‐Vision Application

Heavy Mn²⁺ Doped MgAl₂O₄ Phosphor for High‐Efficient Near‐Infrared Light‐Emitting Diode and the Night‐Vision Application

A new type of phosphate-based phosphor Na₃CsMg₇(PO₄)₆:Eu²⁺/Mn²⁺with high quantum efficiency and high thermostability

Thermodynamic investigation of Ti doping in MgAl₂O₄ based on the first-principles method