Luminescent properties of Eu2+ ions in AlN at low and high intensity of excitation

Mareš, J.; Baltramiejūnas, R.; Narkevičius, V.; Vaitkus, J.

doi:10.1007/bf01589311

Cited by 5 publications

(5 citation statements)

References 15 publications

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“…Following a fast initial decay, the fluorescence decays with a long lifetime. These two lifetimes can be considered to be associated with various types of luminescent centers of Eu 2+ in AlN lattice 13 . The lifetimes of τ fast (1.85 μs) and τ slow (9.01 μs) in the phosphor with BaF 2 flux are very close to the lifetimes of the phosphor with no flux (1.64 and 9.15 μs, respectively).…”

Section: Resultsmentioning

confidence: 81%

The Effects of Fluxes on AlN:Eu²⁺Blue Phosphors Synthesized by a Carbothermal Reduction Method

Yin

et al. 2011

J. Am. Ceram. Soc.

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Different fluxes had been used in the preparation of AlN:Eu2+ blue phosphors by the carbothermal reduction method. The influence of these fluxes on the phase composition, crystallinity, particle size, and photoluminescence (PL) of the produced phosphors was investigated. X‐ray diffraction and microstructure characterizations showed that both CaF2 and BaF2 were excellent nitridation promoters for the synthesis of AlN:Eu2+ phosphors, because pure and highly crystallized AlN was obtained with 3 wt% fluxes. The use of CaF2 flux resulted in phosphors which featured a very weak blue shift emission due to lattice distortion and lattice imperfection caused by the incorporation of Ca into the AlN host, according to the results of IR spectra, decay curves, and the changes in lattice parameters. In comparison with phosphors produced without the use of fluxes, the use of BaF2 flux resulted in phosphors with higher PL intensity by a factor of 2.4, which were produced at lower soaking temperature and shorter soaking time. Finally, a simple reaction mechanism for the nitridation process was also suggested.

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Section: Resultsmentioning

confidence: 81%

The Effects of Fluxes on AlN:Eu²⁺Blue Phosphors Synthesized by a Carbothermal Reduction Method

Yin

et al. 2011

J. Am. Ceram. Soc.

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“…One point is that Eu 2+ ions are possibly located at some defect sites formed in stacking faults because Eu 2+ is too large to substitute Al 3+ 39,40 . The other point is that Eu 2+ ions can replace Al 3+ in AlN lattice () 41 . Recently, lattice location studies of Yb 3+ indicates that Re ions occupy substitutional Al lattice sites in the AlN host 4 .…”

Section: Resultsmentioning

confidence: 99%

“…39,40 The other point is that Eu 21 ions can replace Al 31 in AlN lattice (r cov Al 3þ ¼ 126 pm). 41 Recently, lattice location studies of Yb 31 indicates that Re ions occupy substitutional Al lattice sites in the AlN host. 4 Ronning et al 42 also reported that In and Sr atoms mainly occupy substitutional lattice sites directly according to the results of emission channeling and perturbed angular correlation spectroscopy experiments.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Eu²⁺‐Doped AlN Phosphors by Carbothermal Reduction

Yin

et al. 2010

Journal of the American Ceramic Society

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Eu2+‐doped aluminum nitride (AlN) phosphors were prepared by a carbothermal reduction process in ambient N2 atmosphere. Their structures and luminescence properties were studied in terms of the reaction temperature, soaking time, Eu2+ concentration, and carbon content. Pure AlN:Eu2+ phosphors could be obtained with a reaction temperature of 1750°C and a soaking time of 8 h. The dominant emission wavelength of the phosphor could be tuned widely from blue to green by changing the carbon content, which was attributed to the decrease of oxygen content with the increase of carbon content. An obvious enhancement in luminescence intensity was observed by the addition of Li+ to the host of AlN:Eu2+ phosphors, which was due to the promotion of crystallinity, the increase of grain size, and the decrease of lattice distortion.

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“…The luminescence properties of AlN:Eu 2+ phosphors was first reported by Mares . Recently, blue‐emitting AlN:Eu 2+ and AlN:Ce 3+ phosphors obtained by Si codoping were successfully prepared by a gas pressure sintering method .…”

Section: Introductionmentioning

confidence: 92%

“…[5][6][7] The luminescence properties of AlN:Eu 2+ phosphors was first reported by Mares. 8 Recently, blue-emitting AlN:Eu 2+ and AlN:Ce 3+ phosphors obtained by Si codoping were successfully prepared by a gas pressure sintering method. [9][10][11] In our previous study, we also obtained a pure AlN phase with Eu doping and presented detailed information about the exact location and luminescence mechanism of Eu in the AlN crystal lattice.…”

Section: Introductionmentioning

confidence: 99%

Improved Blue‐Emitting AlN:Eu²⁺ Phosphors by Alloying with GaN

et al. 2015

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A method is designed to improve the luminescence of AlN-based phosphors by tuning the band structure and crystal structure due to alloying with GaN. The pure (Al,Ga)N:Eu phosphors were initially prepared by gas-phase reaction in an NH 3 atmosphere. GaN alloying was used to expand the crystal lattice of AlN due to Ga 3+ substituting for smaller Al 3+ ions, making dissolution of Eu 2+ easier. The dissolution of Ga in the AlN lattice was proven by the result of the Rietveld refinement and the increase in lattice parameters with increasing Ga content. To introduce other energy states mixing with the 5d states of Eu 2+ , Ga doping was also used to tune the band structure of AlN by acting on Eu 2+ ions. The theoretical result was analyzed using the Cambridge Sequential Total Energy Package (CASTEP). According to the calculated total and atom resolved partial density of states, it was observed that the Ga 5p states contribute a large portion to the corresponding Eu 2+ absorption band in (Al,Ga)N:Eu phosphors. As a consequence, an enhanced emission intensity at 470 nm and a high quantum efficiency for excitation at 330 nm was obtained despite of stronger thermal quenching of the (Al,Ga)N:Eu phosphors compared with AlN:Eu.

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Luminescent properties of Eu2+ ions in AlN at low and high intensity of excitation

Cited by 5 publications

References 15 publications

The Effects of Fluxes on AlN:Eu²⁺Blue Phosphors Synthesized by a Carbothermal Reduction Method

The Effects of Fluxes on AlN:Eu²⁺Blue Phosphors Synthesized by a Carbothermal Reduction Method

Synthesis of Eu²⁺‐Doped AlN Phosphors by Carbothermal Reduction

Improved Blue‐Emitting AlN:Eu²⁺ Phosphors by Alloying with GaN

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Luminescent properties of Eu2+ ions in AlN at low and high intensity of excitation

Cited by 5 publications

References 15 publications

The Effects of Fluxes on AlN:Eu2+Blue Phosphors Synthesized by a Carbothermal Reduction Method

The Effects of Fluxes on AlN:Eu2+Blue Phosphors Synthesized by a Carbothermal Reduction Method

Synthesis of Eu2+‐Doped AlN Phosphors by Carbothermal Reduction

Improved Blue‐Emitting AlN:Eu2+ Phosphors by Alloying with GaN

Contact Info

Product

Resources

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The Effects of Fluxes on AlN:Eu²⁺Blue Phosphors Synthesized by a Carbothermal Reduction Method

The Effects of Fluxes on AlN:Eu²⁺Blue Phosphors Synthesized by a Carbothermal Reduction Method

Synthesis of Eu²⁺‐Doped AlN Phosphors by Carbothermal Reduction

Improved Blue‐Emitting AlN:Eu²⁺ Phosphors by Alloying with GaN