Simulation of Temperature Induced Colorimetric Shift of YAG:Ce0.06,GDx Phosphor

2011 ◽  
Vol 55-57 ◽  
pp. 675-679
Author(s):  
Ting Ji ◽  
Xiao Song Zhang ◽  
Qun Xi
Keyword(s):  
Color Temperature ◽  
Broad Emission Band ◽  
Concentration Increase ◽  
Solid State Method ◽  
Clear Trend ◽  
Chromaticity Coordinate ◽  
Broad Emission ◽  
Chromaticity Coordinates ◽  
State Method ◽  
Increasing Temperature

YAG:Ce0.06,Gdxphosphors were prepared by solid-state method, and temperature dependence of chromaticity coordinate and correlated color temperature of YAG:Ce0.06,Gdxare investigated. Three PL spectra all have broad emission band between 500 nm and 620 nm is assigned to the combination of the lowest energy of 5d bands and the2F5/2and2F7/2states respectively. With increasing temperature, the x values of chromaticity coordinates of YAG:Ce0.06,Gdxwith Gd concentration increase all increase, but y values all decrease. Differently, z values do not show a clear trend. Moreover, correlated color temperature of YAG:Ce0.06,Gdxwith Gd concentration increase all decrease with the temperature increase.

Computer Simulation of Temperature Induced Spectra Broadening and Shift in Y3Al5O12:Ce Phosphor

2010 ◽  
Vol 159 ◽  
pp. 578-583
Author(s):  
Ting Ji ◽  
Qun Xi ◽  
Yan Fang Zhang
Keyword(s):  
Computer Simulation ◽  
Temperature Dependence ◽  
Broad Emission Band ◽  
Chi Square ◽  
Solid State Method ◽  
Xrd Pattern ◽  
Broad Emission ◽  
State Method ◽  
Increasing Temperature ◽  
532 Nm

Y3Al5O12:Ce phosphor was prepared by solid-state method, and the XRD pattern is consistent with the standard phase of YAG. Temperature dependence photoluminescence (PL) measurements of Y3Al5O12:Ce excited at 342 nm only show a broad emission band with peak at 532 nm is assigned to the combination of the lowest energy of 5d bands and the 2F5/2 and 2F7/2 states respectively. And full widths at half maximum (FWHM) and emission energy of Y3Al5O12:Ce emission increase with increasing temperature. The red shift and FWHM in the PL spectra with the temperature increasing are simulated by equations for the temperature dependence using LM, BFGS, DE, GA and SA algorithms, and compared the RMSE, SSE, R, R^2, DC and Chi-Square of each result respectively. Moreover, comparison of the result from the computer simulation in LM, BFGS, DE, GA and SA methods through compared values of the RMSE, SSE, R, R^2, DC and Chi-Square parameters are discussed.

scholarly journals Single-Composition White Light Emission from Dy3+ Doped Sr2CaWO6

Materials ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 431 ◽  
Author(s):  
Yannan Dai ◽  
Shuai Yang ◽  
Yongkui Shan ◽  
Chun-Gang Duan ◽  
Hui Peng ◽  
...  
Keyword(s):  
White Light ◽  
Light Emission ◽  
Double Perovskite ◽  
Host Lattice ◽  
Color Temperature ◽  
Solid State Method ◽  
Optimal Doping ◽  
Chromaticity Coordinate ◽  
Infra Red ◽  
State Method

A series of Dy3+ ion doped Sr2CaWO6 phosphors with double perovskite structure were synthesized by traditional high temperature solid-state method. It was found that there is significant energy transfer between Dy3+ and the host lattice, and the intensities of emission peaks at 449 nm (blue), 499 nm (cyan), 599 nm (orange), 670 nm (red), and 766 nm (infra-red) can be changed by adjusting the concentration of dopant amount of Dy3+ ion in Sr2CaWO6. The correlated color temperature of Dy3+ ion doped Sr2CaWO6 phosphors can be tuned by adjusting the concentration of Dy3+ ion. Upon optimal doping at 1.00 mol% Dy3+, white light with chromaticity coordinate (0.34, 0.33) was emitted under excitation at 310 nm. Thus, single composition white emission is realized in Dy3+ doped Sr2CaWO6.

scholarly journals Yellow Emission Obtained by Combination of Broadband Emission and Multi-Peak Emission in Garnet Structure Na2YMg2V3O12: Dy3+ Phosphor

Molecules ◽  
2020 ◽  
Vol 25 (3) ◽  
pp. 542 ◽  
Author(s):  
Weiyi Zhang ◽  
Can He ◽  
Xiaowen Wu ◽  
Ximing Huang ◽  
Fankai Lin ◽  
...  
Keyword(s):  
Solid State ◽  
White Light ◽  
Emission Band ◽  
Uv Light ◽  
Light Emitting Diode ◽  
Color Temperature ◽  
Broad Emission Band ◽  
Yellow Emission ◽  
Conventional Solid State Reaction ◽  
Broad Emission

The fabrication and luminescent performance of novel phosphors Na2YMg2V3O12:Dy3+ were investigated by a conventional solid-state reaction method. Under near-UV light, the Na2YMg2V3O12 host self-activated and released a broad emission band (400–700 nm, with a peak at 524 nm) ascribable to charge transfer in the (VO4)3− groups. Meanwhile, the Na2YMg2V3O12:Dy3+ phosphors emitted bright yellow light within both the broad emission band of the (VO4)3- groups and the sharp peaks of the Dy3+ ions at 490, 582, and 663 nm at a quenching concentration of 0.03 mol. The emission of the as-prepared Na2YMg2V3O12:Dy3+ phosphors remained stable at high temperatures. The obtained phosphors, commercial Y2O3:Eu3+ red phosphors, and BaMgAl10O17:Eu2+ blue phosphors were packed into a white light-emitting diode (WLED) device with a near-UV chip. The designed WLED emitted bright white light with good chromaticity coordinates (0.331, 0.361), satisfactory color rendering index (80.2), and proper correlation to a color temperature (7364 K). These results indicate the potential utility of Na2YMg2V3O12:Dy3+ phosphor as a yellow-emitting phosphor in solid-state illumination.

Synthesis and Optical Characterization of M-α-Sialon (M=Ca, Ba, Sr) Doped by Europium

2014 ◽  
Vol 90 ◽  
pp. 141-148
Author(s):  
Daniel Michalik ◽  
Tomasz Pawlik ◽  
Malgorzata Sopicka-Lizer ◽  
Radosław Lisiecki
Keyword(s):  
Chemical Resistance ◽  
Solid State Reaction Method ◽  
Rare Earth Ions ◽  
Color Temperature ◽  
Broad Emission Band ◽  
White Led ◽  
Photoluminescence Properties ◽  
Synthesis Parameters ◽  
Broad Emission

Oxynitrides compounds are interesting for white LED industry because more covalent matrix's bonds in comparison to oxides enable to obtain higher color temperature of wLED. The Sialon's luminescence material doped by rare earth ions with high mechanical and chemical resistance and a broad emission band may become an alternative for garnet phosphors. The goal of the study was to investigate influence of divalent stabilizing cations on luminescence properties of M-α-Sialon doped with Eu2+in order to estimate its potential for YAG:Ce replacement in WLEDs. The compound of general formula EuxM1-xSi9,6Al2,4O0,8N15,2, where M=Ca, Ba, Sr, was prepared by the solid state reaction method from the mixture of the relevant oxides, nitrides and carbonates. Synthesis was carried out at the temperature of 1650°C for 4 h in a reduction atmosphere (N2+CO). The structure and morphology of obtained powders were analyzed by XRD and SEM/EDS methods, respectively. Optical properties were investigated by excitation, emission and reflection spectra and compared to photoluminescence properties of standard YAG:Ce. The obtained specimens show the significant effect of synthesis parameters on the phase composition and intensity of emission of M-α-Sialon:Eu2+powder.

LUMINESCENT PROPERTIES OF Sr3B2O6: Eu2+ YELLOW-EMITTING PHOSPHOR FOR WHITE LIGHT-EMITTING DIODES

2013 ◽  
Vol 06 (01) ◽  
pp. 1350009 ◽  
Author(s):  
QUAN-SHENG LIU ◽  
TIAN CUI ◽  
XI-YAN ZHANG ◽  
YUE SONG
Keyword(s):  
Wide Band ◽  
Luminescent Properties ◽  
Color Temperature ◽  
Broad Emission Band ◽  
Band Spectrum ◽  
White Led ◽  
Solid State Method ◽  
Light Emitting ◽  
Yellow Phosphor ◽  
Cie Chromaticity

Eu2+ doped Sr3B2O6 yellow phosphor for warm white LED was synthesized by high temperature solid-state method. The structure and optical properties of Sr3B2O6 : Eu2+ were studied. Results indicate that Sr3B2O6 : Eu2+ has a rhombohedral crystalline structure. The excitation spectrum of phosphor is a wide-band spectrum mainly peaking at 469 nm, which is suitable for GaN -based blue light LED excitation. The luminescent spectrum of phosphor exhibits a broad emission band centered at 566 nm, corresponding to the typical 4f65d1–4f7 transition of Eu2+ . Guass fitting shows the main emission peak is at 575 nm, which is identical with the dominant wavelength of the yellow phosphor. The CIE chromaticity coordinate of white LED is (x = 0.389, y = 0.419). The LED reveals warm tone and the relevant color temperature of that is 4044 K. The luminescent efficiency of White LED reaches 18l m/W, which is higher than reported.

scholarly journals More superior pyroelectric performance of synthesized dravite by high-pressure solid-state method

AIP Advances ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 035304
Author(s):  
You Shan ◽  
Guojun Zhou ◽  
Kairen Chen ◽  
Changchun Zhao ◽  
Kun Shen ◽  
...  
Keyword(s):  
High Pressure ◽  
Solid State ◽  
Solid State Method ◽  
State Method

scholarly journals Light Output, Thermal Properties, and Reliability of Using Glass Phosphors in WLED Packages

Coatings ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 239
Author(s):  
Chin-Chuan Huang ◽  
Tsung-Han Weng ◽  
Chun-Liang Lin ◽  
Yan-Kuin Su
Keyword(s):  
Thermal Properties ◽  
Yttrium Aluminum Garnet ◽  
Saturated Vapor ◽  
Light Output ◽  
Junction Temperature ◽  
Color Temperature ◽  
Light Emitting ◽  
Chromaticity Coordinate ◽  
White Light Emitting Diodes ◽  
Color Rendering

White-light-emitting diodes (WLED) based on yttrium aluminum garnet (YAG) phosphors sintered with glass (PiG) and with silicone (PiS) are compared in terms of their light properties, temperature properties and reliability.The complete YAG phosphor was doped with an encapsulant traditional WLED (PiS WLED), and the WLED was covered with PiG (PiG WLED). PiG was made by sintering glass powder and YAG phosphor at the ratio of 87:13 (%), and the correlated color temperature (CCT) was 5564 K. The CCT of the PiG WLED with the YAG doping concentration of 8.5 wt.% approximated 5649 K. The initial light output of the PiG WLED was 6.4% lower than that of the PiS WLED. Under 1008 h and 350 mA aging, PiG WLED and PiS WLED’ light output, CCT and color rendering index variation rates were all within 1%. In the saturated vapor-pressure test, no sample exhibited red ink infiltration, light nor peeling between the encapsulant and the lead-frame. Compared with that of the PiS WLED, the junction temperature of the PiG WLED reduced from 88.4 °C to 81.3 °C. Thermal resistance dropped from 37.4 °C/W to 35.6 °C/W. The PiG WLED presented a better CIE (Commission Internationale de l’Eclairage) 1931 chromaticity coordinate (x,y) concentration and thermal properties than the PiS WLED.

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