Comparative study of blue laser diode driven cerium-doped single crystal phosphors in application of high-power lighting and display technologies

Balcı, Mustafa H.; Chen, Fan; Cunbul, A. Burak; Svensen, Øyvind; Akram, Muhammad Nadeem; Chen, Xuyuan

doi:10.1007/s10043-017-0386-z

Cited by 53 publications

(29 citation statements)

References 12 publications

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“…Single crystals have superior thermal robustness owing to the ideal structure, but suffer from serious non‐uniformity of light spot and rather low light extraction efficiency. Moreover, the materials are limited to garnet systems so far . Phosphor ceramics allow for the microstructure tailoring (such as pores, secondary phases, and grain sizes) and offer great freedom in performance control.…”

Section: Discussionmentioning

confidence: 99%

“…They exhibit outstanding thermal stability, high IQE, and comparatively high thermal conductivity. YAG‐based garnet single crystals are attracting great attention for the high‐brightness white laser lighting . Arjoca et al.…”

Section: Survey Of Laser Phosphorsmentioning

confidence: 99%

“…Balci et al. recently investigated the performances of a series of garnet single crystals such as Lu 3 Al 5 O 12 :Ce (LuAG:Ce), Y 3 Al 5 O 12 :Ce (YAG:Ce), Gd 3 (Ga,Al) 5 O 12 :Ce (GAGG:Ce), and (Gd,Y) 3 Al 5 O 12 :Ce (GdYAG:Ce) for laser lighting . The photoluminescence spectra show that the addition of Gd to the host lattice results in a red‐shifted emission whereas the Lu addition causes a blue‐shift ( Figure a).…”

Section: Survey Of Laser Phosphorsmentioning

confidence: 99%

“…a) Emission spectra of single crystals with different chemical compositions ( λ ex = 445 nm), b) temperature‐dependent IQE, c) temperature (bottom columns) and quantum efficiency (top columns) as a function of the excitation power density, and d) luminescent images of the single crystals excited by an incident power density of 0.4 kW cm −2 and the corresponding temperatures recorded by the IR camera. Reproduced with permission . Copyright 2018, Springer.…”

Section: Survey Of Laser Phosphorsmentioning

confidence: 99%

“…The motivation of this article is to overview the state‐of‐art progress on the existing laser phosphors and to provide guidelines for the design of novel laser phosphors. This review starts with the fundamental requirements for laser phosphors, followed by the survey of several phosphor candidates, such as single crystal, phosphor ceramic, phosphor‐in‐glass (PiG), phosphor film, and quantum‐well LED . Then, we discuss the typical computational simulations on luminescence saturation and light uniformity encountered in laser lighting.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Color Conversion Materials for High‐Brightness Laser‐Driven Solid‐State Lighting

Wang

Hirosaki

et al. 2018

Laser & Photonics Reviews

273

191

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Solid‐state lighting is advancing toward higher power, higher brightness, and smaller size to cope with the market competitiveness, and laser‐driven solid‐state lighting technology is springing up owing to its super‐high brightness and compactness. These developments put forward new requirements for color conversion materials (i.e., phosphors). Here, the state‐of‐art achievements in laser phosphors are summarized, and the topics of luminescence saturation, light extraction efficiency, and light uniformity encountered in laser lighting technology are discussed. Several typical types of color converters, such as single crystal, phosphor ceramics, phosphor‐in‐glass, phosphor films, and quantum‐well light‐emitting diodes, are comparatively overviewed and discussed. The cutting‐edge applications of high‐brightness white laser light in lighting, displays, healthcare, and communications are summarized. The challenges and outlook in laser‐driven solid‐state lighting and some empirical rules for designing novel laser phosphors are highlighted.

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Section: Discussionmentioning

confidence: 99%

Section: Survey Of Laser Phosphorsmentioning

confidence: 99%

Section: Survey Of Laser Phosphorsmentioning

confidence: 99%

Section: Survey Of Laser Phosphorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Color Conversion Materials for High‐Brightness Laser‐Driven Solid‐State Lighting

Wang

Hirosaki

et al. 2018

Laser & Photonics Reviews

273

191

View full text Add to dashboard Cite

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YAG:Ce³⁺ Transparent Ceramic Phosphors Brighten the Next‐Generation Laser‐Driven Lighting

et al. 2020

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Y3Al5O12:Ce3+ (YAG:Ce3+) transparent ceramic phosphors (TCPs) are regarded as the most promising luminescent converter for laser‐driven (LD) lighting. High‐quality YAG:Ce3+ TCPs are still urgent for high efficiency LD lighting devices. YAG:Ce3+ TCPs in a vacuum ambience by using nano‐sized raw materials are prepared. Controlling defects by adding nano‐sized MgO and SiO2 simultaneously enables a high transmittance nearly 80%. After annealing in air furthermore, the luminous efficiency is enhanced greatly from 106 to 223 lm W−1, which is the best result reported now for LD lighting. These results demonstrate that the optimizing YAG:Ce3+ TCPs in a fitting strategy will brighten once again in the next‐generation LD lighting. Based on scanning electron microscopy (SEM) coupled with a cathodoluminescence system, defects and Ce3+ distributions in grains are identified directly for the first time.

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Three Birds with One Stone: K₂SiF₆:Mn⁴⁺ Single Crystal Phosphors for High‐Power and Laser‐Driven Lighting

Zhou

Song

et al. 2020

Advanced Optical Materials

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the broadband excitation in the blue region (≈450 nm) and efficient narrowband red emission at ≈630 nm, these phosphors are the ideal candidates as red components in LED backlight displays and warm WLEDs lighting. [5] However, these phosphors are always suffering from poor moisture resistance and lower external quantum efficiency (EQE). [6] Though the moisture resistance can be effectively improved by coating inorganic or organic layer, it inevitably increases the surface defects, which would eventually reduce the EQE, as well as affect the thermal stability and heat dissipation. [7] Generally, higher Mn 4+ concentrations lead to higher absorption and retain high EQE. [8] Moreover, Mn 4+ ions are exposed to the outside of the particle surface, which in turn leads to Mn 4+ hydrolysis. [9] Therefore, it is a fundamental challenge to realize the balance between the high EQE and excellent moisture resistance for Mn 4+-doped fluoride red phosphors. [6,10] Single crystal phosphor represented by YAG was regarded as a promising alternative to powder counterpart due to its high crystallization, fewer defects, and higher thermal conductivity. [11] Especially, the effective heat dissipation compared to powder phosphor in encapsulants, facilitates the dissipation of heat in the devices. [12] In this regard, high quantum efficiency, moisture resistance, and thermal stability can be expected in Mn 4+-doped fluoride single crystals, which are essential for high power applications. Herein, micrometer-size cubic K 2 SiF 6 :Mn 4+ (KSFM) single crystals were grown by a saturated crystallization method. The formation of Mn 4+-rare surface layer on KSFM single crystal particles was studied considering the crystallization process. The excellent performance of KSFM single crystal on moisture resistance, high quantum efficiency, thermal quenching stability, and effective heat dissipation were evaluated in detail. The as-fabricated KSFM single crystal phosphors converted white LEDs or LDs devices have the potential to be used for high-power and high-brightness backlight displays or lighting devices, and the result could initiate the exploration of new single crystal materials and Mn 4+-doped fluoride single crystals for other emerging applications. 2. Results and Discussion The schematic flow chart of this saturated crystallization method is shown in Figure 1a, and the typical KSFM single crystals Narrow-band red-emitting fluoride phosphors play a crucial role in lighting and backlight displays, whereas the stability issue is a major challenge. Here, highly stable K 2 SiF 6 :Mn 4+ (KSFM) single crystal phosphors with tunable sizes (20-1000 µm) are grown by a facile saturated crystallization method. The small specific surface area together with the unique Mn 4+-rare interface layer in KSFM single crystals enables the simultaneous fulfillment of high external quantum efficiency, excellent moisture, improved thermal quenching, and dissipation for high-power and laser-driven lighting applications. As a prototype, a warm white laser diode dev...

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Comparative study of blue laser diode driven cerium-doped single crystal phosphors in application of high-power lighting and display technologies

Cited by 53 publications

References 12 publications

Color Conversion Materials for High‐Brightness Laser‐Driven Solid‐State Lighting

Color Conversion Materials for High‐Brightness Laser‐Driven Solid‐State Lighting

YAG:Ce³⁺ Transparent Ceramic Phosphors Brighten the Next‐Generation Laser‐Driven Lighting

Three Birds with One Stone: K₂SiF₆:Mn⁴⁺ Single Crystal Phosphors for High‐Power and Laser‐Driven Lighting

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Comparative study of blue laser diode driven cerium-doped single crystal phosphors in application of high-power lighting and display technologies

Cited by 53 publications

References 12 publications

Color Conversion Materials for High‐Brightness Laser‐Driven Solid‐State Lighting

Color Conversion Materials for High‐Brightness Laser‐Driven Solid‐State Lighting

YAG:Ce3+ Transparent Ceramic Phosphors Brighten the Next‐Generation Laser‐Driven Lighting

Three Birds with One Stone: K2SiF6:Mn4+ Single Crystal Phosphors for High‐Power and Laser‐Driven Lighting

Contact Info

Product

Resources

About

YAG:Ce³⁺ Transparent Ceramic Phosphors Brighten the Next‐Generation Laser‐Driven Lighting

Three Birds with One Stone: K₂SiF₆:Mn⁴⁺ Single Crystal Phosphors for High‐Power and Laser‐Driven Lighting