Up-conversion photoluminescence properties and energy transfer process of Ho3+,Yb3+ Co-doped BaY2F8 fine fibers
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Monoclinic crystal system
Electrospinning
The Sr3B2O6:Eu(2+) yellow phosphor for warm white LED was synthesized by high temperature solid phase method. The influences on the phosphor structure and luminous properties of sintering temperature and holding time were systematically studied. Results indicated that the optimum synthetic temperature and soaking is 1 150 degrees C and 2 hours respectively. The crystalline structure of phosphor is rhombohedral Sr3B2O6. Sintering temperature and holding time has a significant influence on grain development. The excitation spectrum of phosphor composes of a wide-band spectrum main peaking at 398 nm, and the phosphor can be excited by near ultraviolet and blue light. The luminescence spectrum of phosphor is a broad spectrum peaking at 574 nm. Sintering temperature and holding time have a main effect on luminous intensity of phosphor.
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High-luminous green phosphors and a red phosphor have been newly developed for white LEDs. The developed green phosphors are Ca3(Sc,Mg)2Si3O12:Ce made by replacing with Mg a part of Sc of green phosphor Ca3Sc2Si3O12:Ce, a new green phosphor CaSc2O4:Ce, and a new host material doped with a rare-earth element, Ba3Si6O12N12:Eu. The new red phosphor is (Sr,Ca)AlSiN3:Eu made by replacing a part of Ca of CaAlSiN3:Eu with Sr.
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A series of blue-emitting phosphors M2B5O9Cl: Eu2+(M=Ca, Sr) were synthesized by solid-state methods. And the phosphors were characterized by XRD and photoluminescence emission (PL) and excitation (PLE) spectra. The factors that affect the PL intensity of phosphor Sr2B5O9Cl have been investigated, and the optimal conditions to obtain the blue emitting phosphor are 8 mol% Eu2+concentration, 5.0mol % excess of SrCl2. As Ca partially or completely substituted Sr in the host Sr2B5O9Cl, the emission peak shifts from 425 to 453 nm. The most important is that the phosphors M2B5O9Cl: Eu2+(M=Ca, Sr) show strong absorption in the region of 350—400 nm, which matches well with the emission of the near-ultraviolet or purple LED chips. Comparison with the commercial blue-emitting phosphor, the PL intensity of phosphor Sr1.92Eu0.08B5O9Cl is about 1.8 times that of the commercial blue emitting phosphor BAM. Thus, the phosphors M2B5O9Cl: Eu2+ (M=Ca, Sr) show great potential as the candidate for blue phosphor in n-UV or purple based white LEDs.
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Emission intensity
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The Structure and Spectrum Properties of non-balled red phosphor Y_2O_3:Eu~(3+) synthesized by oxalic acid precipitation method were carried out in this experiment.The result shows that the size of the phosphor has a good homogeneity.The phosphor is fine and uniformly distributed.The diameter of the phosphor is 4-6 μm.The maximum peaks of excitation spectrum(λex) of the phosphor is at 238 nm.,the maximum peaks of emission spectrum(λem) is at 613 nm.,the luminescent chromatic coordinate parameters are x=0.645 4,y=0.340 8 and the relative luminescent is 181.The red phosphor meets with the demand of application as lamp phosphor.
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Plasma display
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In this paper, we present a color tunable long persistent phosphor, prepared by using a remote phosphor. The blue light emission of Sr2MgSi2O7: Eu2+, Dy3+ long persistent phosphor was tuned from blue to near white region with the help of Y3Al5O12: Ce3+ as remote phosphor. To achieve the multicolor tunability, the two phosphors, Sr2MgSi2O7: Eu2+, Dy3+ and Y3Al5O12: Ce3+ were mixed in a different weight ratio(S: Y). The cause behind such kind of color tunability is the persistent radiative energy transfer from long persistent luminescence (LPL) of Sr2MgSi2O7: Eu2+, Dy3+ phosphor to non-LPL Y3Al5O12: Ce3+ phosphor. The composite Sr2MgSi2O7: Eu2+, Dy3+/Y3Al5O12: Ce3+ has a long afterglow with steady color during decay. To excite Y3Al5O12: Ce3+ phosphor, here we used the blue light energy of the Sr2MgSi2O7: Eu2+, Dy3+ as a phosphorescent light source. Our principal objective to achieve color tunable long persistent phosphors was obtained by combining these two, blue and yellow, light emissions. For detailed investigations, the phosphors were further characterized by XRD, Photoluminescence and afterglow decay. So our approach may be a way to convert the color of other long persistent phosphor by using remote phosphor.
Persistent luminescence
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Luminous efficacy
Photostimulated luminescence
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The thermal and optical characteristics of phosphor converted white light-emitting diodes (LEDs) with different phosphor concentrations ranging from 4 wt % to 13 wt % are investigated. The light output of LEDs with higher phosphor concentration is found to have larger degradation in constant current compared with pulse current than that with lower phosphor concentration. In addition, the junction temperatures of phosphor converted white LEDs raise with increasing phosphor concentration, so that the decreased phosphor conversion efficiency is observed both in pulse and constant current modes. The physical mechanisms for these observations are discussed. This study elucidates the phosphor dependent optical and thermal behavior of phosphor converted white LEDs.
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The photoluminescence properties and quantum efficiency of potential red, green, and blue (RGB) phosphors are measured under near-ultraviolet excitation (380–420 nm). The suitability of several phosphors is discussed for their application in phosphor-liquid crystal displays (LCDs). K5Eu2.5(WO4)6.25, SrGa2S4:Eu, and BaMgAl10O17:Eu phosphors are chosen as RGB phosphors for making a phosphor-LCD prototype. The color coordinates and optical properties of phosphor-LCDs are compared to those of conventional LCDs.
RGB color model
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