Synthesis of Eu<sup>2+</sup>‐Doped AlN Phosphors by Carbothermal Reduction

Yin, Liang-Jun; Xu, Xin; Yu, Wei; Yang, Jiayi; Yang, Lu; Yang, Xiaoming; Lu, Hao; Liu, Xuejian

doi:10.1111/j.1551-2916.2010.03638.x

Cited by 33 publications

(32 citation statements)

References 48 publications

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“…Referring to the carbothermal reduction and nitridation in the synthesis of nitrides from oxides and C in N 2 atmosphere [23,24,25], we have applied post heat-treatment of carbon coated YAG:Ce 3+ in N 2 atmosphere in order to check whether it possibly triggers a reaction between C and YAG. Hence, a change in phase composition and microstructure may be introduced into YAG:Ce 3+ , which influences the luminescence properties of YAG:Ce 3+ .…”

Section: Introductionmentioning

confidence: 99%

Transition of Emission Colours as a Consequence of Heat-Treatment of Carbon Coated Ce3+-Doped YAG Phosphors

et al. 2017

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To modify the luminescence properties of Ce3+-doped Y3Al5O12 (YAG) phosphors, they have been coated with a carbon layer by chemical vapor deposition and subsequently heat-treated at high temperature under N2 atmosphere. Luminescence of the carbon coated YAG:Ce3+ phosphors has been investigated as a function of heat-treatment at 1500 and 1650 °C. The 540 nm emission intensity of C@YAG:Ce3+ is the highest when heated at 1650 °C, while a blue emission at 400–420 nm is observed when heated at 1500 °C but not at 1650 °C. It is verified by X-ray diffraction (XRD) that the intriguing luminescence changes are induced by the formation of new phases in C@YAG:Ce3+-1500 °C, which disappear in C@YAG:Ce3+-1650 °C. In order to understand the mechanisms responsible for the enhancement of YAG:Ce3+ emission and the presence of the blue emission observed for C@YAG:Ce3+-1500 °C, the samples have been investigated by a combination of several electron microscopy techniques, such as HRTEM, SEM-CL, and SEM-EDS. This local and cross-sectional analysis clearly reveals a gradual transformation of phase and morphology in heated C@YAG:Ce3+ phosphors, which is related to a reaction between C and YAG:Ce3+ in N2 atmosphere. Through reaction between the carbon layer and YAG host materials, the emission colour of the phosphors can be modified from yellow, white, and then back to yellow under UV excitation as a function of heat-treatment in N2 atmosphere.

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Section: Introductionmentioning

confidence: 99%

Transition of Emission Colours as a Consequence of Heat-Treatment of Carbon Coated Ce3+-Doped YAG Phosphors

et al. 2017

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“…Even with a much smaller grain size, the emission intensity of the obtained AlN:Eu nanophosphor can reach as high as 70% of that of the microsized AlN:Eu phosphor obtained by the carbothermal reduction route reported previously. 16 This could be attributed to the homogeneous distribution of Eu in the nanosized AlN crystal. The line emission in the spectral region from 550 to 630 nm, corresponding to the 5 D 0 -7 F 1 and 5 D 0 -7 F 2 transitions of the Eu 31 ions, has not been detected due to the forbidden f-f transitions.…”

Section: Resultsmentioning

confidence: 98%

“…16,[18][19][20] The involvement of high temperatures, which is an inherently inevitable condition in these methods, leads to abnormal grain growth and the formation of hard agglomerates. Thus, many researchers have focused on the synthesis of binary or ternary transition metal nitrides using chemically complex precursors, [21][22][23][24] expecting lower temperatures for the formation of crystalline phases as well as the suppression of grain growth, thereby promoting the formation of nanocrystals.…”

Section: Introductionmentioning

confidence: 99%

“…11 Thus, there are many studies on AlN thin films or phosphors doped with rare-earth or transition metals. [12][13][14][15][16][17] The development of phosphors with controlled morphology and nanosized particles, which will make possible the achievement of high packing density and a low light scattering coefficient, is a great challenge in modern technology because it will lead to improvements in the brightness and resolution of displays. Thus, nanooxynitride phosphors can be considered as candidates in the field of luminescent labeling.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of nanosized AlN:Eu²⁺phosphors using a metal-organic precursor method

Cai

et al. 2014

J. Mater. Res.

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Nanosized Eu 21 -doped AlN phosphor was successfully synthesized by a metal-organic precursor method for the first time. Aluminum and europium chlorides were simultaneously reacted with triethylamine in acetonitrile media to yield solid precipitates, which were transformed into nanosized AlN:Eu 21 phosphor powders upon calcination in an ammonia gas atmosphere. The possible reaction mechanism was proposed, which is in good agreement with the experimental results. The direct formation of Al-N bonds through a coordination reaction in solution is a key factor in the formation of well-crystallized AlN:Eu 21 grains at a moderately low temperature (1200°C), which significantly suppresses abnormal grain growth and favors the formation of nanocrystalline (;15 nm) particles with a homogeneous particle size distribution. Due to the homogeneous distribution of a relative high amount of Eu incorporation (2 wt%), the nanophosphors were effectively excited by UV light and featured an intense green emission band with a peak at 506 nm.

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“…This indicates that BSAON can be more widely used in WLEDs. It should be pointed out that one advantage of oxynitride phosphor is that the N/O ratio could be adjusted between certain limits, 15 so the emission wavelength of BASON is expected to be adjusted as required.…”

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A High Stable Blue BaSi3Al3O4N5:Eu2+ Phosphor for White LEDs and Display Applications

Tang¹,

Xie²,

Huang³

et al. 2011

Electrochem. Solid-State Lett.

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A novel BaSi 3 Al 3 O 4 N 5 :Eu 2þ blue phosphor has been developed for the first time. Rietveld refinements of XRD data indicate that BaSi 3 Al 3 O 4 N 5 crystallizes in the monoclinic space group P2 1 /m. This phosphor exhibits comparable photoluminescence intensity with that of commercial BaMgAl 10 O 17 :Eu 2þ blue phosphor under vacuum ultraviolet (VUV) and near-ultraviolet (NUV) excitation. Furthermore, it shows excellent thermal and chemical stabilities, high quenching temperature, and higher converting efficiency under NUV excitation. The excellent photoluminescence and stability have been analyzed in terms of the stiff crystal structure of BaSi 3 Al 3 O 4 N 5 . This phosphor could be a promising blue candidate for light-emitting diodes and plasma display panels.The driving forces of the recent developments are climate change, energy saving, and energy efficiency. 1 White light-emitting diodes (WLEDs) (Ref. 2) are generally believed to be the next generation luminescent technology, owing to their long lifetime, low energy consumption, environmental friendliness, and high reliability. Most commercially available WLEDs are produced by combining a blue diode chip with Y 3 Al 5 O 12 :Ce 3þ yellow phosphor, but they show poor color rendering and low stability of color temperature. 3 One alternative way to achieve white light is the combination of red, green, and blue phosphors with a near-ultraviolet (NUV) diode. 3 Up to now, BaMgAl 10 O 17 :Eu 2þ (BAM) phosphor 4 is the best blue phosphor and widely used in three-band fluorescence lamps and plasma display panels (PDPs) for its high quantum efficiency. Unfortunately, it suffers from a deterioration of color quality and efficiency during panel fabrication (thermal treatment in air) and panel operation (VUV damage). In addition, it is not well suitable for NUV LED chip due to its low quantum efficiency under 340-420 nm excitation.Various efforts have been made to develop novel blue phosphors, such as Ba phosphors have many disadvantages of photoluminescence or stability. For example, Ba 5 SiO 4 Cl 6 :Eu 2þ must be kept away from any moisture, the intensity of BaAl 2 Si 2 O 8 :Eu 2þ decreases sharply after being baked at 600 C in air, and SrAl 10Àx B x Si 2 O 20 :Eu 2þ has too many polymorphs to get pure phase. The application of a phosphor should meet the comprehensive standards, such as high quantum efficiency, good thermal and chemical stabilities, high quenching temperature. Therefore, efforts are still being made to explore novel blue phosphors.Recently, rare-earth doped (oxy)nitridosilicate phosphors have attracted more and more attentions due to their thermal and chemical stability because of the strong covalent Si(O,N) 4 network of the lattice. 10-12 Based on these facts, we succeeded in synthesizing a novel BaSi 3 Al 3 O 4 N 5 :Eu 2þ (BSAON) blue phosphor. It exhibits comparable photoluminescence intensity with that of commercial BAM, what's more, it presents many superior properties than BAM, such as higher converting efficiency in the NUV light range, h...

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Synthesis of Eu²⁺‐Doped AlN Phosphors by Carbothermal Reduction

Cited by 33 publications

References 48 publications

Transition of Emission Colours as a Consequence of Heat-Treatment of Carbon Coated Ce3+-Doped YAG Phosphors

Transition of Emission Colours as a Consequence of Heat-Treatment of Carbon Coated Ce3+-Doped YAG Phosphors

Synthesis of nanosized AlN:Eu²⁺phosphors using a metal-organic precursor method

A High Stable Blue BaSi3Al3O4N5:Eu2+ Phosphor for White LEDs and Display Applications

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Synthesis of Eu2+‐Doped AlN Phosphors by Carbothermal Reduction

Cited by 33 publications

References 48 publications

Transition of Emission Colours as a Consequence of Heat-Treatment of Carbon Coated Ce3+-Doped YAG Phosphors

Transition of Emission Colours as a Consequence of Heat-Treatment of Carbon Coated Ce3+-Doped YAG Phosphors

Synthesis of nanosized AlN:Eu2+phosphors using a metal-organic precursor method

A High Stable Blue BaSi3Al3O4N5:Eu2+ Phosphor for White LEDs and Display Applications

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Synthesis of Eu²⁺‐Doped AlN Phosphors by Carbothermal Reduction

Synthesis of nanosized AlN:Eu²⁺phosphors using a metal-organic precursor method