Emission color variation of M2SiO4:Eu2+ (M=Ba, Sr, Ca) phosphors for light-emitting diode

Kim, J.S.; Jeon, Pyung Eun; Choi, Jun‐Chul; Park, H.L.

doi:10.1016/j.ssc.2004.10.017

Cited by 217 publications

(132 citation statements)

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“…For instance, the luminescence effi ciency of M 2 SiO 4 :Eu 2+ (M = Sr, Ba) decreases to 50% of the room-temperature value at 400 K and is much lower than that of the orthosilicate presented in this study. [ 41 ] As suggested by Ram Seshadri et al, the difference in activation energy and thermal quenching properties likely originates from the connectivity and the rigidity of the compounds. [ 42 ] The M 2 SiO 4 phosphor contains isolated SiO 4 tetrahedral units that have a greater degree of freedom when excited, allowing for an enhancement of non-radiative relaxation via active phonon pathways.…”

Section: Full Paper Full Paper Full Papermentioning

confidence: 95%

“…Therefore, the BLS:Ce 3+ phosphor has a superior thermal stability than most nitride phosphors, silicate phosphors, and the commercial YAG:Ce 3+ phosphor. [ 21,25,41,42 ] This novel green phosphor, BLS:Ce 3+ , not only exhibits a high thermal stability for its luminescence effi ciency, but also shows a stability in the luminescence color. As shown in Figure 5 b, a slight blue shift of approximately 5 nm is found when the temperature increases from 293 K to 553 K, leading to a blue shift of the CIE coordinates of BLS:Ce 3+ from (0.2552, 0.3938) to (0.2301, 0.3345) shown in Figure 6 .…”

Section: Full Paper Full Paper Full Papermentioning

confidence: 99%

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Ba₉Lu₂Si₆O₂₄:Ce³⁺: An Efficient Green Phosphor with High Thermal and Radiation Stability for Solid‐State Lighting

Liu

Zhang

et al. 2015

Advanced Optical Materials

172

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into visible light. Phosphor plays an important role in determining the performance of white LEDs, such as, their color rendering, luminous effi ciency, lifetime, and so on. [4][5][6][7][8][9][10][11][12][13][14] A number of promising phosphors have already been explored and their suitability for white LEDs has been demonstrated. In particular, nitride phosphors have drawn much attention due to their high chemical and high thermal stability. [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31] At the operating temperature of current white LEDs (ca. 150 °C), nitride phosphors can maintain 80-90% of the room temperature luminescence intensity, [ 18,[21][22][23][24][25] and some of them can even reach 95% at 200 °C. [ 31 ] Nitride phosphors are usually synthesized via solid-state reaction (SSR), gas reduction and nitridation (GRN), carbothermal reduction and nitridation (CRN), or high-pressure ammonothermal methods. [ 21,22 ] These synthesis techniques are often complex, require expensive and moisture-sensitive raw materials, a long processing time at a high temperature (1400-2000 °C), and a high nitrogen or ammonia pressure (100 MPa), leading to very high costs associated with the production of these phosphors. It is therefore necessary to search for novel phosphors with high effi ciency and low thermal degradation that can be synthesized easily.In this work, we report on a novel orthosilicate phosphor, Ba 9 Lu 2 Si 6 O 24 :Ce 3+ , which is synthesized by a simple SSR process at a relatively low reaction temperature of 1400 °C. The optical properties of this phosphor are comparable with those of nitride phosphors. Ba 9 Lu 2 Si 6 O 24 :Ce 3+ exhibits a main excitation band around 400 nm, which matches the emission light of near-UV chips. Under this excitation, it shows a green emission band around 490 nm with a width of 120 nm. Its internal quantum effi ciency (QE) can be as high as 82% with an absorbance of 0.60, resulting in an external QE of about 50%, which is equivalent to that of most nitride phosphors. Moreover, this green phosphor shows a very high thermal stability, and its luminescence intensity at 160 °C preserves nearly 94% of the initial luminescence intensity at room temperature. This is very superior to that of most nitride phosphors. In this paper, the synthesis and the crystal structure analysis of Ba 9 Lu 2 Si 6 O 24 are reported. The origins of the excellent thermal stability are also investigated by using classical thermal quenching theory.Among the inorganic phosphors used in advanced solid-state lighting technologies, nitridosilicates have drawn signifi cant attention because of their superior photoluminescence properties with high effi ciency and high thermal stabilities. However, the synthesis of nitride phosphors usually requires strict processing conditions and a long processing time, leading to very high manufacturing costs. Herein, a novel orthosilicate green phosphor, Ba 9 Lu 2 Si 6 O 24 :Ce 3+ , is synthesized via a simple solid-state reaction. The photoluminescence char...

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Section: Full Paper Full Paper Full Papermentioning

confidence: 95%

Section: Full Paper Full Paper Full Papermentioning

confidence: 99%

Ba₉Lu₂Si₆O₂₄:Ce³⁺: An Efficient Green Phosphor with High Thermal and Radiation Stability for Solid‐State Lighting

Liu

Zhang

et al. 2015

Advanced Optical Materials

172

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“…Eu 2+ takes up the site of M(I), which forms a large bond length and weak crystal field, while Eu(II) is situated at the site of M(II), forming a short bond length and strong crystal field [21] . Therefore, as shown in Figure 2, M 2 SiO 4 : Eu 2+ present two emission bands.…”

Section: Binary Silicate Systemmentioning

confidence: 99%

The development of silicate matrix phosphors with broad excitation band for phosphor-convered white LED

2008

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“…The structure of MZr 2 (PO 4 ) 3 (M = Na, K) has stability and flexibility which allows isovalent and heterovalent substitutions at all non-oxygen lattice sites and give rise to a large number of compounds with identical topology of connections between their structural units. Due to the dependence of these properties on the framework structure, MZr 2 (PO 4 ) 3 compounds have attracted significant interest for their low thermal expansion, their diversity of ionic conductivity, and catalytic properties [8,14,15] (A. R.) were used as reagents for the sample preparations. Stoichiometric amounts of the raw materials were combined into a homogeneous mixture in an agate mortar and calcined at 1200…”

Section: Introductionmentioning

confidence: 99%

Synthesis and photoluminescence properties of MZr2(PO4)3:Eu3+; Bi3+ (M=Na; K) phosphors

Huang

Zhou

et al. 2012

Open Physics

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Abstract:A series of new red phosphors, MZr 2 (PO 4 ) 3 :Eu 3+ ; Bi 3+ (M=Na; K), were synthesized using the solidstate reaction method, and their photoluminescence spectra were measured. The MZr 2 (PO 4 ) 3 :Eu 3+ ; Bi 3+ (M=Na; K) phosphors were efficiently excited by an ultraviolet (UV; 395 nm) source, and showed intense orange-red emission at 595 nm. Further investigation of the concentration-dependent emission spectra indicated that the MZr 2 (PO 4 ) 3 :Eu 3+ ; Bi 3+ (M=Na; K) phosphors exhibit the strongest luminescence intensity when y = 0.01 in NaZr 2(0 95− ) (PO 4 ) 3 :Eu

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Emission color variation of M2SiO4:Eu2+ (M=Ba, Sr, Ca) phosphors for light-emitting diode

Cited by 217 publications

References 7 publications

Ba₉Lu₂Si₆O₂₄:Ce³⁺: An Efficient Green Phosphor with High Thermal and Radiation Stability for Solid‐State Lighting

Ba₉Lu₂Si₆O₂₄:Ce³⁺: An Efficient Green Phosphor with High Thermal and Radiation Stability for Solid‐State Lighting

The development of silicate matrix phosphors with broad excitation band for phosphor-convered white LED

Synthesis and photoluminescence properties of MZr2(PO4)3:Eu3+; Bi3+ (M=Na; K) phosphors

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Emission color variation of M2SiO4:Eu2+ (M=Ba, Sr, Ca) phosphors for light-emitting diode

Cited by 217 publications

References 7 publications

Ba9Lu2Si6O24:Ce3+: An Efficient Green Phosphor with High Thermal and Radiation Stability for Solid‐State Lighting

Ba9Lu2Si6O24:Ce3+: An Efficient Green Phosphor with High Thermal and Radiation Stability for Solid‐State Lighting

The development of silicate matrix phosphors with broad excitation band for phosphor-convered white LED

Synthesis and photoluminescence properties of MZr2(PO4)3:Eu3+; Bi3+ (M=Na; K) phosphors

Contact Info

Product

Resources

About

Ba₉Lu₂Si₆O₂₄:Ce³⁺: An Efficient Green Phosphor with High Thermal and Radiation Stability for Solid‐State Lighting

Ba₉Lu₂Si₆O₂₄:Ce³⁺: An Efficient Green Phosphor with High Thermal and Radiation Stability for Solid‐State Lighting