Enhanced fluorescence and heat dissipation of calcium titanate red phosphor based on silver coating

Chen, Zhenhua; Qin, Xinxin; Zhang, Qinghong; Li, Yaogang; Wang, Hongzhi

doi:10.1016/j.jcis.2015.08.008

Cited by 9 publications

(4 citation statements)

References 34 publications

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“…The graphene deposited on the Si/SiO 2 substrate had a thermal conductivity of 978 W m –1 K –1 (assuming a temperature coefficient of −1.62 × 10 –2 cm –1 /K); , this was somewhat higher than the thermal conductivity of the supported single-layer graphene reported previously. − Lastly, the transmittance of the graphene layer of between 400 and 800 nm was above 95%, as shown in Figure d. The high transmittance in the visible range is one of the advantages of graphene over other high thermal conductivity materials …”

Section: Resultsmentioning

confidence: 81%

“…The high transmittance in the visible range is one of the advantages of graphene over other high thermal conductivity materials. 27 An overall process for the graphene wrapping of the PGP is illustrated in Figure 1e. Both sides of the PGP were wrapped with two pieces of the CVD graphene, employing a poly(methyl methacrylate) (PMMA)-assisted transfer method to move the graphene (grown on copper) to the PGP.…”

Section: Resultsmentioning

confidence: 99%

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Effective Heat Dissipation from Color-Converting Plates in High-Power White Light Emitting Diodes by Transparent Graphene Wrapping

Kim¹,

Shim²,

Unithrattil³

et al. 2015

ACS Nano

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We have developed a hybrid phosphor-in-glass plate (PGP) for application in a remote phosphor configuration of high-power white light emitting diodes (WLEDs), in which single-layer graphene was used to modulate the thermal characteristics of the PGP. The degradation of luminescence in the PGP following an increase in temperature could be prevented by applying single-layer graphene. First, it was observed that the emission intensity of the PGP was enhanced by about 20% with graphene wrapping. Notably, the surface temperature of the graphene-wrapped PGP (G-PGP) was found to be higher than that of the bare PGP, implying that the graphene layer effectively acted as a heat dissipation medium on the PGP surface to reduce the thermal quenching of the constituent phosphors. Moreover, these experimental observations were clearly verified through a two-dimensional cellular automata simulation technique and the underlying mechanisms were analyzed. As a result, the proposed G-PGP was found to be efficient in maintaining the luminescence properties of the WLED, and is a promising development in high power WLED applications. This research could be further extended to generate a new class of optical or optoelectronic materials with possible uses in a variety of applications.

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Section: Resultsmentioning

confidence: 81%

Section: Resultsmentioning

confidence: 99%

Effective Heat Dissipation from Color-Converting Plates in High-Power White Light Emitting Diodes by Transparent Graphene Wrapping

Kim¹,

Shim²,

Unithrattil³

et al. 2015

ACS Nano

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“…Generally, these properties could be improved by better crystallization and purifying materials. Current challenges on phosphors research to obtain desired phosphors for lighting application is briefly reviewed in Table 1 respectively on luminescent features and high quantum efficiency [2][3][4][5][6][7], reduced of RE usage for host phosphor [8][9][10][11][12][13][14][15][16][17], morphology and size [18][19][20][21][22][23][24][25][26][27][28][29][30], preparation/synthesis methods [9,[31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48], and new phosphors …”

Section: Phosphor For Lighting Applicationsmentioning

confidence: 99%

Challenging and development of phosphors for lighting applications

Panatarani¹,

Joni²

2016

AIP Conference Proceedings

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Abstract. Phosphors (inorganics luminescent material) have been extensively investigated due to their potential application especially for lighting. This article briefly reviews the developments of the phosphors for lighting application. Research and development of phosphors for the application of energy-saving lamps have been developed in the Laboratory of Instrumentation System and Functional Materials Processing, Department of Physics, Universitas Padjadjaran. To fulfill the desired feature for lighting application, we developed host-center type phosphor with compositional modifications prepared by spray pyrolysis and simple solution routes. In order to meet the industry requirement with high production rate, currently we scaled up the spray pyrolysis utilized with a pulse combustion reactor.

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“…However, the lack of red component in the spectrum leads to a cold white light emission with low color rendering index (Ra < 80) and high color temperature (CCT > 4500 K). [6][7][8] Therefore, intensive attentions have been focused on the near ultraviolet (UV) excited white LEDs, which exhibit near natural white emission. 9 As for the encapsulated phosphors, regulating the energy transfer and emissions of multiple activators is considered as a useful method to achieve white emission.…”

mentioning

confidence: 99%

A Novel White-Light-Emitting Phosphor Based on Bi³⁺-Doped BaLu₂MgGa₂Si₂O₁₂ for Near-UV Excited White LEDs

Zhang

Wang

Fang

et al. 2021

ECS J. Solid State Sci. Technol.

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Bi3+-activated luminescence materials have gained growing attentions for optoelectronic applications. In this work, a novel BaLu2MgGa2Si2O12: Bi3+ garnet phosphor was synthesized through a traditional high-temperature solid phase reaction method. The crystal structure was ascertained through X-ray diffraction analysis and Rietveld structural refinement. The particle morphology and constituent elements distributions were investigated through scanning electron microscope and element mapping. Excited at 330 or 370 nm, the phosphors exhibit two emission peaks located at 413 and 495 nm, which is ascribed to the allowed transitions of Bi3+: 3P1 → 1S0. The luminescence intensity reaches the maximum at the 4 mol% Bi3+ doping content, and the emission color is easily manipulated by tuning the excitation wavelength. Besides, the luminescence intensity at 150 ℃ remains 80% of that at room temperature. These results suggest that the novel phosphors have promising application in the near-UV excited white LEDs.

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Enhanced fluorescence and heat dissipation of calcium titanate red phosphor based on silver coating

Cited by 9 publications

References 34 publications

Effective Heat Dissipation from Color-Converting Plates in High-Power White Light Emitting Diodes by Transparent Graphene Wrapping

Effective Heat Dissipation from Color-Converting Plates in High-Power White Light Emitting Diodes by Transparent Graphene Wrapping

Challenging and development of phosphors for lighting applications

A Novel White-Light-Emitting Phosphor Based on Bi³⁺-Doped BaLu₂MgGa₂Si₂O₁₂ for Near-UV Excited White LEDs

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Enhanced fluorescence and heat dissipation of calcium titanate red phosphor based on silver coating

Cited by 9 publications

References 34 publications

Effective Heat Dissipation from Color-Converting Plates in High-Power White Light Emitting Diodes by Transparent Graphene Wrapping

Effective Heat Dissipation from Color-Converting Plates in High-Power White Light Emitting Diodes by Transparent Graphene Wrapping

Challenging and development of phosphors for lighting applications

A Novel White-Light-Emitting Phosphor Based on Bi3+-Doped BaLu2MgGa2Si2O12 for Near-UV Excited White LEDs

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A Novel White-Light-Emitting Phosphor Based on Bi³⁺-Doped BaLu₂MgGa₂Si₂O₁₂ for Near-UV Excited White LEDs