Phosphor in glasses with Pb-free silicate glass powders as robust color-converting materials for white LED applications

Lee, Yl Kwon; Lee, Jin Seok; Heo, Jong; Im, Won Bin; Chung, Woon Jin

doi:10.1364/ol.37.003276

Cited by 177 publications

(108 citation statements)

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“…Inorganic color converters based on ceramics or glasses have thus been extensively studied and applied, to realize high power and high brightness WLEDs [3][4][5][6]. Among them, bulk glass phosphors (BGP) which consist of a glass matrix and active elements such as rare earth (RE) ions, transition metal ions and quantum dots, are strong candidates for inorganic color converters.…”

Section: Introductionmentioning

confidence: 99%

“…Among them, bulk glass phosphors (BGP) which consist of a glass matrix and active elements such as rare earth (RE) ions, transition metal ions and quantum dots, are strong candidates for inorganic color converters. Unlike other inorganic color converters such as phosphor ceramics (PC) [3,4] or phosphor in glass (PiG) [5,6], BGP does not require ceramic phosphors or additional fabrication processes and can be formed into various shapes, which can reduce production costs effectively.…”

Section: Introductionmentioning

confidence: 99%

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Eu2+/Eu3+-doped oxyfluoride glass ceramics with LaF3 for white LED color conversion

et al. 2015

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Eu2+/Eu3+-doped oxyfluoride glass ceramics with LaF3 for white LED color conversion

et al. 2015

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“…Lee et al 58 developed PiG from SiO 2 -B 2 O 3 -RO (R = Ba,Zn)-based glass frits and YAG:Ce 3+ powders by sintering at 750…”

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.

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127

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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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“…Glass materials have been proposed as alternative binders for phosphor powders to alleviate the thermal degradation of polymer resins. Phosphor-in-glass composites (PiGs) have higher efficiencies than do polymer-based mixtures [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Phosphor-in-glasses composites containing light diffusers for high color uniformity of white-light-emitting diodes

Chung

Heo

2015

J Sol State Light

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ZrO 2 light diffuser layers was placed on phosphor-in-glass composites (PiGs) to improve color uniformity of white-light-emitting diodes (white LEDs). Color coordinates of central part and periphery of white LEDs were (0.34, 0.38) and (0.36, 0.43), respectively; difference between two area decreases with the introduction of a diffuser layer. Color temperature difference also decreased from 770 to 464 K. The addition of diffuser layers reduced the luminous efficacy of the white LEDs from 90.3 to 83.4 lm/W.

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Phosphor in glasses with Pb-free silicate glass powders as robust color-converting materials for white LED applications

Cited by 177 publications

References 11 publications

Eu2+/Eu3+-doped oxyfluoride glass ceramics with LaF3 for white LED color conversion

Eu2+/Eu3+-doped oxyfluoride glass ceramics with LaF3 for white LED color conversion

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

Phosphor-in-glasses composites containing light diffusers for high color uniformity of white-light-emitting diodes

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