Synthesis and Luminescent Properties of Na5LaxM1-x(WO4)4 (M = Eu, Sm, Bi) Red Phosphors for WLED

2012 ◽  
Vol 624 ◽  
pp. 244-247 ◽  
Author(s):  
De Cai Huang ◽  
You Fu Zhou ◽  
Wen Tao Xu ◽  
Zhang Fu Yang ◽  
Mao Chun Hong ◽  
...  
Keyword(s):  
Rietveld Method ◽  
Luminescent Properties ◽  
Solid State Reactions ◽  
Red Phosphor ◽  
Light Emitting ◽  
Red Phosphors ◽  
Chromaticity Coordinates ◽  
Cie Chromaticity ◽  
White Light Emitting Diodes ◽  
The Impact

A series of Na5La(WO4)4:M3+ (M = Eu, Sm, Bi) phosphors have been synthesized successfully by the solid-state reactions. The corresponding crystal structure and lattice parameters were refined by the Rietveld method, and the impact of doped metal ions upon the structure were also studied. The photoluminescent properties were investigated at room temperature. All the samples were observed a strong red emission under 395nm or 465 nm excitation, and the CIE chromaticity coordinates (x = 0.67, y = 0.33) was found to be close to the National Television Standard Committee (NTSC) standard red, implying high color purity. This kind of tungstate phosphor is a promising candidate as the red phosphor for white light-emitting diodes (WLED).

A novel orange-red phosphor Ca3B2O6:Sm3+, A+(A = Li, Na, K) for white light emitting diodes

2014 ◽  
Vol 07 (03) ◽  
pp. 1450033 ◽  
Author(s):  
Qingbo Liu ◽  
Yufeng Liu ◽  
Fu Yang ◽  
Bing Han ◽  
Hao Feng ◽  
...  
Keyword(s):  
Emission Spectrum ◽  
Integral Intensity ◽  
Red Light ◽  
Red Phosphor ◽  
Light Emitting ◽  
Red Phosphors ◽  
Near Ultraviolet ◽  
Bright Orange ◽  
Cie Chromaticity ◽  
White Light Emitting Diodes

A novel orange-red phosphor Ca 3 B 2 O 6: Sm 3+, A+( A = Li , Na , K ) has been synthesized by solid-state reaction at 950°C. The phase purity and photoluminescence (PL) behavior of the phosphor are studied in detail using the powder X-ray diffraction (XRD) technique and PL measurements. Ca 3 B 2 O 6: Sm 3+ phosphor can be efficiently excited by near ultraviolet (n-UV) and blue light, and the emission spectrum consists of four emission peaks at 563, 599, 646 and 709 nm, generating bright orange-red light. When a cation A+ is introduced into Ca 3 B 2 O 6: Sm 3+ as charge compensator, the emission intensity of Ca 3 B 2 O 6: Sm 3+ is evidently enhanced, but the PL spectral profile is unchanged. The integral intensity of the emission spectrum of Ca 2.96 Sm 0.02 Na 0.02 B 2 O 6 excited at 401 nm is about 1.2 times than that of Y 2 O 2 S : Eu 3+ commercial red phosphor. The CIE chromaticity coordinates of Ca 2.96 Sm 0.02 Na 0.02 B 2 O 6 phosphor were (0.608, 0.365), which are close to that of the commercial red phosphors Y 2 O 3: Eu 3+ (0.655, 0.345), Y 2 O 2 S : Eu 3+ (0.622, 0.351) and Sr 2 Si 5 N 8: Eu 2+ (0.620, 0.370).

Preparation and Luminescent Properties of Na5Eu(MoO4)4-x(PO4)x Red Phosphors for White Light-Emitting Diodes Application

2010 ◽  
Vol 654-656 ◽  
pp. 2025-2028 ◽  
Author(s):  
Cui Sheng Xi ◽  
Shi Kao Shi ◽  
Hui Li Gong ◽  
Ji Zhou
Keyword(s):  
White Light ◽  
Light Emitting Diodes ◽  
Luminescent Properties ◽  
Solid State Reaction Method ◽  
Conventional Solid State Reaction ◽  
Red Phosphor ◽  
Light Emitting ◽  
Red Phosphors ◽  
Relative Emission Intensity ◽  
White Light Emitting Diodes

(PO4)3- -doped red phosphors, Na5Eu(MoO4)4-x(PO4)x (x ≤ 0.10), were prepared by the conventional solid-state reaction method, and their luminescent properties were studied. Under the excitation of near-UV 395 nm, the phosphors show intense red emission. In particular, the relative emission intensity of Na5Eu(MoO4)3.96(PO4)0.04 sample reaches about 5.0 times in comparison with that of the commercial red phosphor Y2O2S:Eu3+. The phosphor could be suitable for the application of white light-emitting diodes.

Novel polygonal structure Mn4+ activated In3+-based Elpasolite-type hexafluorides red phosphor for warm white light-emitting diodes (WLEDs)

2019 ◽  
Vol 48 (4) ◽  
pp. 1376-1385 ◽  
Author(s):  
Feng Hong ◽  
Haiming Cheng ◽  
Chao Song ◽  
Guixia Liu ◽  
Wensheng Yu ◽  
...  
Keyword(s):  
White Light ◽  
Light Emitting Diodes ◽  
Synthetic Methods ◽  
Red Phosphor ◽  
Light Emitting ◽  
White Leds ◽  
Red Phosphors ◽  
Polygonal Structure ◽  
Warm White Light ◽  
White Light Emitting Diodes

Red phosphors (NH4)2NaInF6:Mn4+ with controllable morphology were synthesized via different synthetic methods, which can be fabricated for warm white LEDs.

Perovskite white light-emitting diodes with a perovskite emissive layer blended with rhodamine 6G

2020 ◽  
Vol 8 (37) ◽  
pp. 12951-12958 ◽  
Author(s):  
Che-Yu Chang ◽  
Wei-Li Hong ◽  
Pei-Hsuan Lo ◽  
Tzu-Hsiang Wen ◽  
Sheng-Fu Horng ◽  
...  
Keyword(s):  
White Light ◽  
Light Emitting Diodes ◽  
Rhodamine 6G ◽  
Light Emitting ◽  
Emissive Layer ◽  
Chromaticity Coordinates ◽  
Halide Perovskites ◽  
Cie Chromaticity ◽  
White Light Emitting Diodes

Perovskite white light-emitting diodes with only a single emissive layer of halide perovskites and rhodamine 6G were realized with the CIE chromaticity coordinates of (0.33, 0.40).

Synthesis and Luminescence Properties of a Blue-Emitting Sr3NaLu(PO4)3F:Eu2+ Phosphor

2017 ◽  
Vol 727 ◽  
pp. 623-627 ◽  
Author(s):  
Zai Fa Yang ◽  
Deng Hui Xu ◽  
Xue Dong Gao ◽  
Jiang Nan Du ◽  
Jia Yue Sun
Keyword(s):  
Blue Emission ◽  
Fluorescence Decay ◽  
Ultraviolet Region ◽  
X Ray Diffraction ◽  
Blue Emission Band ◽  
Light Emitting ◽  
Near Ultraviolet ◽  
Chromaticity Coordinates ◽  
Cie Chromaticity ◽  
White Light Emitting Diodes

A novel blue-emitting Sr3NaLu (PO4)3F:Eu2+ phosphor for white light-emitting diodes (w-LEDs) have been successfully prepared via the solid-state reaction. The crystal structure and phase of the prepared phosphors were investigated using X-ray diffraction (XRD). The band gap of Sr3NaLu (PO4)3F was estimated to be about 5.79 eV from the diffuse reflection spectrum. The Sr3NaLu (PO4)3F:0.05Eu2+ phosphor exhibits an intense and broad excitation band ranging from 200 to 450 nm in the near ultraviolet region and produces a bright blue emission band with the CIE chromaticity coordinates of x = 0.133 and y = 0.148 under the excitation of 365 nm, which were ascribed to the 4f-5d transitions of Eu2+. Moreover, the fluorescence decay curves were also investigated in detail. All the results suggest that Sr3NaLu (PO4)3F:Eu2+ might be a promising blue-emitting phosphor used in w-LEDs.

scholarly journals Luminescent properties of a novel reddish-orange phosphor Eu-activated KLaSiO4

2019 ◽  
Vol 37 (2) ◽  
pp. 296-300
Author(s):  
Guo Feng ◽  
Wei-Hui Jiang ◽  
Jian-Min Liu
Keyword(s):  
Critical Concentration ◽  
Luminescent Properties ◽  
Conventional Solid State Reaction ◽  
Excellent Thermal Stability ◽  
Light Emitting ◽  
Chromaticity Coordinates ◽  
White Light Emitting Diodes ◽  
Potential Use ◽  
Orange Luminescence ◽  
Reddish Orange

AbstractA novel reddish-orange emitting phosphor Eu-activated KLaSiO4 was synthesized by the conventional solid-state reaction at 1200 °C. The luminescence properties of KLaSiO4:Eu phosphor were investigated, and the critical concentration of the activator ion (Eu3+) was established as 0.02 mol per formula unit. Chromaticity coordinates of a typical KLa0.98SiO4:0.02Eu phosphor were x = 0.614 and y = 0.385. The phosphor exhibited reddish-orange luminescence with dominating emission at 612 nm, corresponding to 5D0 → 7F2 of Eu3+. Furthermore, the phosphor was characterized by excellent thermal stability, implying its potential use in white light emitting diodes.

Perovskite white light-emitting diodes based on a molecular blend perovskite emissive layer

2019 ◽  
Vol 7 (28) ◽  
pp. 8634-8642 ◽  
Author(s):  
Che-Yu Chang ◽  
Alexander N. Solodukhin ◽  
Shih-Yu Liao ◽  
K. P. O. Mahesh ◽  
Ching-Ling Hsu ◽  
...  
Keyword(s):  
White Light ◽  
Light Emitting Diodes ◽  
Light Emitting ◽  
Emissive Layer ◽  
Chromaticity Coordinates ◽  
Cie Chromaticity ◽  
White Light Emitting Diodes

Perovskite white light-emitting diodes with only a single emissive layer were realized with CIE chromaticity coordinates of (0.3, 0.49).

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