Yi-Chung Huang

National Chung Hsing University

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Wood-Hi Cheng

National Chung Hsing University

Li‐Yin Chen

National Yang Ming Chiao Tung University

Chun-Chin Tsai

National Sun Yat-sen University

Jin‐Kai Chang

National Sun Yat-sen University

Jien-Wei Yeh

National Tsing Hua University

Jhih-Ci Huang

National Sun Yat-sen University

Yen-Sheng Lin

I-Shou University

Su-Jien Lin

National Tsing Hua University

Hsun-Feng Hsu

National Chung Hsing University

Yung-Peng Chang

National Chung Hsing University

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National Chung Hsing University

National Sun Yat-sen University

National Tsing Hua University

National Taipei University

National Synchrotron Radiation Research Center

National Cheng Kung University

California Institute of Technology

National Kaohsiung University of Applied Sciences

National Taiwan University

University of Glasgow

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Structural and Thermodynamic Factors of Suppressed Interdiffusion Kinetics in Multi-component High-entropy Materials

Scientific Reports (2014)

Shou-Yi Chang Chen-En Li Yi-Chung Huang Hsun-Feng Hsu Jien-Wei Yeh

We report multi-component high-entropy materials as extraordinarily robust diffusion barriers and clarify the highly suppressed interdiffusion kinetics in the multi-component materials from structural and thermodynamic perspectives. The failures of six alloy barriers with different numbers of elements, from unitary Ti to senary TiTaCrZrAlRu, against the interdiffusion of Cu and Si were characterized and experimental results indicated that, with more elements incorporated, the failure temperature of the barriers increased from 550 to 900°C. The activation energy of Cu diffusion through the alloy barriers was determined to increase from 110 to 163 kJ/mole. Mechanistic analyses suggest that, structurally, severe lattice distortion strains and a high packing density caused by different atom sizes, and, thermodynamically, a strengthened cohesion provide a total increase of 55 kJ/mole in the activation energy of substitutional Cu diffusion and are believed to be the dominant factors of suppressed interdiffusion kinetics through the multi-component barrier materials.

High-Entropy Alloys

Component (thermodynamics)

10.1038/srep04162

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Citations (96)

Next-generation glass-base phosphor-converted laser light engine

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2015)

Jin‐Kai Chang Wood-Hi Cheng Yung-Peng Chang Yi-Yin Kuo Chun-Chin Tsai

A highly reliable laser light engine (LLE) employing a novel glass-based phosphor-converted layer is experimentally demonstrated. The LLE module consisted of a blue light laser array and a color wheel, which included two glass-based phosphor-converted layers of yellow YAG:Ce and green LuAG:Ce and a micro motor. The blue light laser array was used to excite the color wheel to create yellow and green lights. The combination of the blue, yellow, and green lights produced high-purity white light for use in LLEs. The glass-based LLE exhibited better thermal stability, higher luminous efficiency of 64.7lm/W(YAG:Ce) and 67.2lm/W (LuAG:Ce), and higher purity of 95.4%(YAG:Ce) and 77.4%(LuAG:Ce). This study clearly demonstrates the advantages of adapting novel glass as a phosphor-converted color wheel in LEL modules that provide higher reliability and better performance of laser projectors for use in the next generation LLEs, particularly in the area where the conventional LLEs employing silicone-based phosphor fails to stand for long and strict reliability is highly required.

Green-light

Luminous flux

10.1117/12.2186375

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Novel broadband glass phosphors for high CRI WLEDs

Optics Express (2014)

Li‐Yin Chen Wood-Hi Cheng Chun-Chin Tsai Jin‐Kai Chang Yi-Chung Huang

New broadband glass phosphors with excellent thermal stability were proposed and experimentally demonstrated for white light-emitting-diodes (WLEDs). The novel glass phosphors were realized through dispersing multiple phosphors into SiO₂ based glass (SiO₂-Na₂O-Al₂O₃-CaO) at 680°C. Y₃Al₅O₁₂:Ce³⁺ (YAG), Lu₃Al₅O₁₂:Ce³⁺ (LuAG), and CaAlSiN₃: Eu²⁺ (nitride) phosphor crystals were chosen respectively as the yellow, green, and red emitters of the glass phosphors. The effect of sintering temperature on inter-diffusion reduction between phosphor crystals and amorphous SiO₂ in nitride-doped glass phosphors was studied and evidenced by the aid of high-resolution transmission electron microscopy (HRTEM). Broadband glass phosphors with high quantum-yield of 55.6% were thus successfully realized through the implementation of low sintering temperature. Proof-of-concept devices utilizing the novel broadband phosphors were developed to generate high-quality cool-white light with trisstimulus coordinates (x, y) = (0.358, 0.288), color-rending index (CRI) = 85, and correlated color temperature (CCT) = 3923K. The novel broadband glass phosphors with excellent thermal stability are essentially beneficial to the applications for next-generation solid-state indoor lighting, especially in the area where high power and absolute reliability are required.

Thermal Stability

Color temperature

10.1364/oe.22.00a671

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High-performance glass phosphor for white-light-emitting diodes via reduction of Si-Ce^3+:YAG inter-diffusion

Optical Materials Express (2013)

Li‐Yin Chen Wood-Hi Cheng Chun-Chin Tsai Yi-Chung Huang Yen-Sheng Lin

A novel Ce3+:YAG doped sodium glass (CeYDG) with low-melting temperature of 693°C and high internal quantum yield of 68% for white-light-emitting diodes (WLEDs) is demonstrated. The glass phosphor possesses glass transition temperatures of 578°C which exhibits a better thermal stability to overcome the thermal limitation of conventional Ce3+:YAG doped silicone due to low thermal stability of around 150°C. To the best of authors’ knowledge, this is the highest quantum yield yet reported for thermally stable glass phosphors. The high quantum yield is achieved by lowering the sintering temperature of 700°C for glass phosphor, which substantially reduces Si-Ce3+:YAG inter-diffusion, evidenced by high-resolution transmission electron microscopy (HRTEM). This new CeYDG with high-quantum yield is essentially beneficial to the applications for next-generation solid-state lighting in the area where high power and absolute reliability are required and where silicone simply could not stand the heat or other deteriorating factors due to its low thermal stability.

Optical materials

Optical glass

10.1364/ome.4.000121

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Citations (58)