A new-generation color converter for high-power white LED: transparent Ce<sup>3+</sup>
:YAG phosphor-in-glass

Zhang, Rui; Lin, Hang; Yu, Yunlong; Chen, Daqin; Xu, Jü; Wang, Yuansheng

doi:10.1002/lpor.201300140

Cited by 532 publications

(321 citation statements)

References 24 publications

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“…Zhang et al 61 As aforementioned, a new glass composition for preventing the recrystallization of the phosphor was proposed by Lee et al 63 They fabricated PiG with glass frits based on the SiO 2 -Na 2 O-RO system, which has the low sintering temperature of 550…”

Section: Glass Phosphor Plate (Gpp)mentioning

confidence: 99%

Review—Phosphor Plates for High-Power LED Applications: Challenges and Opportunities toward Perfect Lighting

Kim

Viswanath

Unithrattil

et al. 2017

ECS J. Solid State Sci. Technol.

125

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In the past decades, solid-state lighting based on phosphors as energy converters has been a fast-growing industry. Phosphorconverted white light-emitting diodes (pc-wLEDs) enable high-power applications and miniaturization; for this, the phosphor must have good stability and high efficiency. In order to satisfy this demand, phosphor plates have been proposed instead of conventional organic-based phosphor binders. In this review, such phosphor plates are categorized according to their synthesis methods, and the advantages and disadvantages of each category are detailed. In addition, we describe the major aspects of phosphor plates that require improvement for applications in high-power devices. For the fabrication of high-power LEDs, the phosphor configuration, color purity, porosity, and particle size of glass powders are key properties to enhance the luminescence efficiency and reduce the generation of heat inside wLED packages, thereby improving thermal stability. The advent of authentic, energy-efficient lighting in the home and workplace significantly affected the modern way of life. Beginning with the mass production of incandescent light bulbs, and with the subsequent evolution of fluorescence lights, lighting technology has developed rapidly in the last few decades. Since Edison's incandescent bulb in 1879, 1 artificial lighting has been developed to increase power output and decrease the size of the system. The development of red light-emitting diodes (LEDs) in 1962 2 and blue LEDs in 1993 3 allowed innovation in lighting and display. In particular, combinations of blue LEDs and yellow phosphors are used for many applications because they can realize cheap and efficient white solid-state lighting with several advantages including long lifetimes, eco-friendly behavior, and the capacity of miniaturization. 4-6In phosphor-converted white LEDs (pc-wLEDs), the phosphor converter dispersed in silicon resin (phosphor-in-silicon; PiS) is directly packed on a blue InGaN chip.7 When driven by a bias current, the emitted blue light absorbed by the phosphor is emitted as yellow light; together with the transmitted blue light, this constitutes white luminescence. However, this method lacks a red component, which entails the drawbacks of a poor color rendering index (CRI) and limited correlated color temperature (CCT). To overcome these drawbacks, one proposed method mixes yellow phosphors with phosphors having green to red emissions under blue excitation. 8 In pc-wLEDs, the color is primarily determined by the ratio of the blue emission from the LED chip to the yellow to red emission from the phosphor. However, the efficacy and brightness are determined by the converted yellow to red emission, as it contributes the bulk of lumens. In this configuration, the heat generated from the LED chip and phosphor cannot be efficiently dissipated because of the poor thermal stability and weak thermal conductivity of the resin, which causes luminous decay and color shifting in white light-emitting diodes (wLEDs).9 When the tempe...

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Section: Glass Phosphor Plate (Gpp)mentioning

confidence: 99%

Review—Phosphor Plates for High-Power LED Applications: Challenges and Opportunities toward Perfect Lighting

Kim

Viswanath

Unithrattil

et al. 2017

ECS J. Solid State Sci. Technol.

125

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“…Since the first small pieces of transparent borosilicate glass prepared by sol-gel process by Dislich in 1971, many glass researchers tried to make bulk silica glasses and multi-component glasses by sol-gel method [28]. Prior to other preparation methods such as deposition [29] and melt quenching [30], the borosilicate glass prepared by sol-gel approach possesses eminent advantages such as good transparency, low formation temperature, significant phase transition, and uniformity of the doping components [31]. Therefore, borosilicate glass is considered a competent base glass to load metal nanoparticles or quantum dots and potential candidate for optoelectronic devices [10].…”

Section: +mentioning

confidence: 99%

Sol-gel synthesis and third-order optical nonlinearity of Au nanoparticles doped monolithic glass

Gao

Xiang

et al. 2015

Gold Bull

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Gold nanoparticles (Au NPs) doped monolithic and transparent sodium borosilicate glass has been synthesized by both sol-gel and atmosphere control heat treatment methods. Fourier transform infrared (FTIR) spectra in the wavenumber range of 400 to 4000 cm −1 were applied to collect variation information of surface groups of the samples in the sintering process. The microstructure of Au NPs in the glass was characterized by means of X-ray powder diffraction (XRD), transmission electron microscopy (TEM), and high-resolution TEM (HRTEM). Meanwhile, the linear optical properties of the glass were analyzed by UV-vis spectrometer between the wavelength of 300 and 1000 nm, and a broad absorption band around 600 nm was observed. The third-order nonlinear optical properties of the glass were investigated by using Z-scan technique at the wavelength of 800 nm, pulse duration of 190 fs, and repetition rate of 20 Hz. The glass showed saturable absorption and self-focusing nonlinear refraction, and the optical nonlinear susceptibility χ (3) was estimated to be 1.7 × 10 −14 esu, with the single-pulse energy of 1 μJ.

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“…The definition of the relevant factors that affect the quality of these new sources is a key aspect for the design and production of such electronic devices. Low cost, energy efficient, mercury-free, long lifetimes, and compactness are the main advantages of LEDs [1]. There are two approaches to white light generation with LEDs: 1) phosphor based white LEDs, and 2) multi-coloured LED solutions -including RGB-LEDs.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Ce:YAG Amount on Structure and Optical Properties of Ce:YAG-PMMA Composites for White LED

Armetta¹,

Sibeko

Luyt

et al. 2016

Zeitschrift Für Physikalische Chemie

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Ce:YAG-poly(methyl methacrylate) (PMMA) composites were prepared by using a melt compounding method, adding several amounts of Ce:YAG in the range 0.1-5 wt. %. The optical properties of the obtained composites and of the composites combined with a blue LED were measured to investigate the effect of the amount of Ce:YAG on the resulting emitted light in view of possible application in white LED manufacture. An increase in Ce:YAG amount caused an increase in the emission and a shift of 15 nm, influencing the white LED performance. The structure and morphology of the composites were studied. The results show that the interaction between the two components, observed by using solid state NMR experiments, are the responsible for the observed shift.

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A new-generation color converter for high-power white LED: transparent Ce³⁺ :YAG phosphor-in-glass

Cited by 532 publications

References 24 publications

Review—Phosphor Plates for High-Power LED Applications: Challenges and Opportunities toward Perfect Lighting

Review—Phosphor Plates for High-Power LED Applications: Challenges and Opportunities toward Perfect Lighting

Sol-gel synthesis and third-order optical nonlinearity of Au nanoparticles doped monolithic glass

Influence of the Ce:YAG Amount on Structure and Optical Properties of Ce:YAG-PMMA Composites for White LED

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A new-generation color converter for high-power white LED: transparent Ce3+ :YAG phosphor-in-glass

Cited by 532 publications

References 24 publications

Review—Phosphor Plates for High-Power LED Applications: Challenges and Opportunities toward Perfect Lighting

Review—Phosphor Plates for High-Power LED Applications: Challenges and Opportunities toward Perfect Lighting

Sol-gel synthesis and third-order optical nonlinearity of Au nanoparticles doped monolithic glass

Influence of the Ce:YAG Amount on Structure and Optical Properties of Ce:YAG-PMMA Composites for White LED

Contact Info

Product

Resources

About

A new-generation color converter for high-power white LED: transparent Ce³⁺ :YAG phosphor-in-glass