(Y, Lu)AG:Ce Phosphors Synthesized by Stearate Melting Method and Their Fluorescence Properties

李金生,; 孙旭东,; 李小东,; 刘绍宏,; 朱琦,

doi:10.15541/jim20140254

Cited by 2 publications

(1 citation statement)

References 21 publications

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“…First, the garnet structure is, at present, the only known oxide host wherein the Ce 3+ dopant can be excited by blue light and emit in the green-orange spectral region with high quantum efficiency and high thermal stability. 1b); for example, (Y,Lu) 3 Al 5 O 12 :Ce shows the green to greenish-yellow emission shift with increasing Y/Lu ratio; 4,23 (2) replacing Al-Al in tetrahedral/octahedral coordination with equal-valence cation pair such as Mg(Ca)-Si (Fig. Second, LuAG:Ce emits a green color, which makes it much easier to achieve yellow emission via red-shift.…”

Section: Introductionmentioning

confidence: 99%

Structure evolution and photoluminescence of Lu₃(Al,Mg)₂(Al,Si)₃O₁₂:Ce³⁺ phosphors: new yellow-color converters for blue LED-driven solid state lighting

et al. 2016

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This paper reports the development of new phosphors using the chemical unit cosubstituting solid solution design strategy. Starting from Lu3Al5O12, the Al 3+ -Al 3+ couple in respective octahedral and tetrahedral coordination were simultaneously substituted by a Mg 2+ -Si 4+ pair forming the Lu3(Al2-xMgx)(Al3-xSix)O12:Ce 3+ (x=0.5-2.0) series; as a result, the CeO8 polyhedrons were compressed and the emission got red-shifted from green to yellow together with the boradening. The evolution of the unit cell, the local structural geometry as well as the optical property of Ce 3+ in these garnet creations, in response to the gradual Mg-Si substitution for Al-Al, were studied by combined techiniques of structural refinement and luminescencent measurements. The new composition Lu2.97Ce0.03Mg0.5Al4Si0.5O12 was comprehensively evaluated ragarding its potential application in blue LED-driven solid state white lighting: the maximum emission is at 550 nm under λex=450 nm; the internal and external quantum efficiency can reach 85 % and 49 %, respectively; one-phosphor-converted wLED lamp fabriacted using the as-prepared phosphor exhibits the luminous efficacy of 105 lm/W, correlated color temperature of 6164 K and color rendering index (Ra) of 75.6. The as-developed composition series is open for further optimization to enhance the competeness for commercial consideration.

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Section: Introductionmentioning

confidence: 99%

Structure evolution and photoluminescence of Lu₃(Al,Mg)₂(Al,Si)₃O₁₂:Ce³⁺ phosphors: new yellow-color converters for blue LED-driven solid state lighting

et al. 2016

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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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(Y, Lu)AG:Ce Phosphors Synthesized by Stearate Melting Method and Their Fluorescence Properties

Cited by 2 publications

References 21 publications

Structure evolution and photoluminescence of Lu₃(Al,Mg)₂(Al,Si)₃O₁₂:Ce³⁺ phosphors: new yellow-color converters for blue LED-driven solid state lighting

Structure evolution and photoluminescence of Lu₃(Al,Mg)₂(Al,Si)₃O₁₂:Ce³⁺ phosphors: new yellow-color converters for blue LED-driven solid state lighting

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

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(Y, Lu)AG:Ce Phosphors Synthesized by Stearate Melting Method and Their Fluorescence Properties

Cited by 2 publications

References 21 publications

Structure evolution and photoluminescence of Lu3(Al,Mg)2(Al,Si)3O12:Ce3+ phosphors: new yellow-color converters for blue LED-driven solid state lighting

Structure evolution and photoluminescence of Lu3(Al,Mg)2(Al,Si)3O12:Ce3+ phosphors: new yellow-color converters for blue LED-driven solid state lighting

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

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Structure evolution and photoluminescence of Lu₃(Al,Mg)₂(Al,Si)₃O₁₂:Ce³⁺ phosphors: new yellow-color converters for blue LED-driven solid state lighting

Structure evolution and photoluminescence of Lu₃(Al,Mg)₂(Al,Si)₃O₁₂:Ce³⁺ phosphors: new yellow-color converters for blue LED-driven solid state lighting