Synthesis and luminescence properties of a H2annealed Mn-doped Y3Al5O12:Ce3+single crystal for WLEDs

Gu, Guorui; Xiang, Weidong; Yang, Cheng Fu

doi:10.1039/c5ce00641d

Cited by 36 publications

(16 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…According to the PL spectra and fluorescence decay curves as well as Refs. [23,26,27], the energy transfer process in YAG:Ce,Mn transparent ceramics can be illustrated as Fig. 9.…”

Section: Resultsmentioning

confidence: 99%

“…Besides, it is commonly accepted that Mn with different valences emit different luminescence properties. Aside from the aforementioned emission wavelength of Mn 2+ ions, Mn 3+ emission bands are observed peaked at 608 and 760 nm attributed to 5 T 2 → 5 E transition and Mn 4+ emission bands are observed peaked at 668 nm attributed to 2 E→ 4 A 2 [26,28]. In this work, the luminescence wavelength of Mn 3+ and Mn 4+ can not be observed and it is worth noting that Mn 2+ is oxidized little or nothing in the vacuum environment, and thus almost Mn 2+ ions exist in YAG:Ce,Mn transparent ceramics.…”

Section: Characterizationmentioning

confidence: 91%

“…Moreover, the Y 3-m-n Ce m Mn n Al 5-n Si n O 12 phosphors were also designed by the incorporation of Mn 2+ -Si 4+ pairs and then realized color point tuning for white light generation [25]. Similarly, the LE of 119.93 lm/W, internal quantum yield of 81.0%, and CRI value of 73.6 as well as CCT value of 5674 K were achieved in a Mn-doped Y 3 Al 5 O 12 :Ce 3+ single crystal for WLEDs application [26]. However, it is difficult to prepare large-sized YAG:Ce,Mn single crystal for long production cycle and high cost.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Red-emitting YAG: Ce, Mn transparent ceramics for warm WLEDs application

et al. 2020

View full text Add to dashboard Cite

A series of YAG:Ce,Mn transparent ceramics were prepared via a solid-state reaction-vacuum sintering method. The effects of various Mn 2+-Si 4+ pair doping levels on the structure, transmittance, and luminescence properties were systematically investigated. These transparent ceramics have average grain sizes of 10-16 μm, clean grain boundaries, and excellent transmittance up to 83.4% at 800 nm. Under the excitation of 460 nm, three obvious emission peaks appear at 533, 590, and 745 nm, which can be assigned to the transition 5d→4f of Ce 3+ and 4 T 1 → 6 A 1 of Mn 2+. Thus, the Mn 2+-Si 4+ pairs can effectively modulate the emission spectrum by compensating broad orange-red and red spectrum component to yield high quality warm white light. After the optimized YAG:Ce,Mn transparent ceramic packaged with blue light-emitting diode (LED) chips, correlated color temperature (CCT) as low as 3723 K and luminous efficiency (LE) as high as 96.54 lm/W were achieved, implying a very promising candidate for application in white light-emitting diodes (WLEDs) industry.

show abstract

“…According to the PL spectra and fluorescence decay curves as well as Refs. [23,26,27], the energy transfer process in YAG:Ce,Mn transparent ceramics can be illustrated as Fig. 9.…”

Section: Resultsmentioning

confidence: 99%

Section: Characterizationmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Red-emitting YAG: Ce, Mn transparent ceramics for warm WLEDs application

et al. 2020

View full text Add to dashboard Cite

show abstract

“…4c. 49 The SCPP for white lighting was also investigated by Latynina et al 50 They fabricated a Y 3 SCPP with diameter (Ø) of 8 mm and thickness (T) of 5 mm is shown in Fig. 4c.…”

Section: Glass Phosphor Plate (Gpp)mentioning

confidence: 99%

“…The SCPP based on YAG single crystal was investigated by Gu et al 49 In this, YAG:Ce 3+ ,Mn 2+ single crystal is grown by the Czochralski method using a [111] oriented single crystal as seed. A transparent crystal of about 15 mm in diameter with bright red coloration is obtained as shown in Fig.…”

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.

128

View full text Add to dashboard Cite

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...

show abstract