Polycrystalline alumina fillets containing various chemical additives were prepared by tape casting for use in bonding trials. Oriented sapphire blanks were edge bonded in a furnace with special fixtures to accurately align and apply a load to the components during heat treatment. This approach is consistent with and builds upon the methods used in the previous edge-bonding studies. Flexure strength of the bonded samples, as compared to monolithic sapphire, was used as the performance metric. Additional bonding runs were carried out using the highest performing fillet composition in order to provide a sufficient number of specimens to conduct a Weibull analysis of the failure probability of the bonded material as a function of applied stress.

A high purity alumina composition containing 3 wt.% SiO2, 0.05 wt.% MgO, and
0.05 wt.% Ti, produced the highest strength bonds. This composition yielded an average fracture strength of 255 MPa (37 kpsi), a Weibull modulus of 8.2, and a characteristic strength of 269 MPa (39 kpsi). These results compare favorably to monolithic sapphire specimens which yielded an average fracture strength of 284 MPa (41 kpsi).

Describes a sapphire single crystal growth, in a dome shape, the gradient freezing method (GSM). Molybdenum is used in a double-walled crucible planted near net shape geometry. This significantly shortens the final size of the dome to the manufacturing process, thereby reducing costs. This process is used with a different shape (hemispherical, etc.), size (maximum diameter 6 inches) and a crystal orientation (including the optical axis) Growth dome. The growth rate of the thermal field and control the grain boundaries and prevent scattering centers is very important, and for the prevention of the action of surface tension generated geometric distortion.

Gradient freeze (GSM) is for large, high-quality single-crystal sapphire and calcium fluoride growth. Several growth parameters (eg, thermal gradient, stability, growth rate and the quality of the thermal field in the starting material) of the quality of the grown crystal was studied correlation. Growth of several types of defects are analyzed to clarify its nature. Crystals characterized by its crystalline and optical properties.

Although Asian countries have actively amplified Sapphire Dan Changjing production capacity , but countries industry trends and current situation varies greatly, and some vendors to support key government forces sent exhibition , some leading polysilicon manufacturers , electronic or branched into , or by the LED related to the upstream vendor integration , showing a variety of industrial style , but also show Sapphire Dan Changjing industry has entered the fast-growing , highly competing industrial phase. Select the most positive development of the following South Korea , mainland China and Taiwan industry status and trends analysis.

Korea Sapphire Dan Changjing Industry : The South Korean government has given the sapphire single crystal materials domestic supply capacity is low, and the key equipment and technology for the control of the US-Russian manufacturers , so in 2010 the ten key materials to promote the development plan (World Premier Materials development program) in selected LED sapphire single crystal material as the main R & D projects , total capital investment in 2018 will be up to 13,743 won. Fostered by the government to enhance its own vendor-specific technology and capacity advantages , the South Korean manufacturer Blaupunkt Dan Changjing production capacity in early 2011 that is promoted as the world's first . The South Korean government to help manufacturers in the near future US-Russian giant breakthrough technology patents , fast substantially increase its capacity , not only to guide their domestic manufacturers cut high growth and high profits in the emerging field , more South Korean development of LED industry reserves a solid material supply capacity.

Sapphire thermal field is a single crystal alumina, has excellent mechanical, optical, chemical and radiation resistance, it is widely used in optical components and machines mechanical manufacturing and other industries. Currently in the production of blue and white LED substrate material is used mainly to sapphire. As blue-white LED has a long life, low power consumption, high luminous efficiency advantage, so LED lighting has become the mainstream of the future.

Because tungsten, molybdenum material has a high temperature, low pollution and other characteristics, are widely used in the furnace hot zone components Dan Changjing Sapphire, including the crucible, the crucible lid, the heating element, heat shield, support rods, base, etc..

It is reported that domestic institutions , corporate research into the field of sapphire substrate is divided into two blocks : one purchases abroad crystal growth furnace , in order from abroad crystal growth furnace get Sapphire Dan Changjing mystery . But surveys show that the use of foreign crystal growth furnace there are " low quality ", " yield is not high," and other issues , so often, and foreign suppliers of crystal growth furnace dispute . In addition, foreign not be advanced , large-size furnaces sold to Chinese enterprises, it is difficult to be eliminated from the old furnace to master truly excellent crystal growth furnace technology ; Second, through its own research and development of crystal growth furnace power . Rely on their own to overcome large-size sapphire Dan Changjing furnace research, risk , although larger, but " Relying on Ourselves " , usually only rely on their own in order to truly master the key technology . However, entrepreneurs should also be aware that their own research and development is no easy task , which requires abundant capital, research and development team together , continuous research firm determination perseverance and leadership .

Solar photovoltaic (PV) installations in the US have now broken through the 10 gigawatt (GW) barrier, following strong market deployment since the start of 2010. During the first half of 2013, more than 1.8 GW of new solar PV capacity was installed in the US, according to the NPD Solarbuzz North America PV Market Quarterly report.

SEOUL, South Korea, June 25, 2013 — /PRNewswire/ -- The nation's largest LED Festival 'International LED EXPO & OLED EXPO 2013′ has opened its door today (25th) for 4 days at the KINTEX Center.

In 4th June 2013 evening, San’an Optoelectronics Co., Ltd. announce that the Company’s wholly-owned subsidiary Lightera Corporation fund $ 22 million make an acquisition that 100% equity interest of U.S. Luminus Devices, Inc., in accordance with the current exchange rate, the amount of investment over hundred million RMB.

Silicon Labs is offering a CMOS-based drop-in replacement for optocoupler-isolated gate drivers.

Supporting up to 5kV isolation ratings and up to 10kV surge protection, the Si826x isolated gate drivers emulate the behaviour of opto-drivers by modulating a high-frequency carrier instead of light from an LED.

According to the supplier, the simpler digital architecture provides a robust isolated data path that requires no special considerations or initialisation at start-up.

After the outbreak of the debt crisis in Europe, LED lighting industry in China that mainly sold abroad began to be transferred to emerging markets, Russian exports accounted for the proportion of exports of China's LED lighting has reached 2.8% in 2012.

Aixtron SE of Herzogenrath, Germany says that the University of Cambridge has commissioned another multi-wafer Aixtron Close Coupled Showerhead (CCS) MOCVD reactor at its new facility at the Department of Material Science and Metallurgy.

It is reported that, Samsung originally planned to be launched flexible screen phone around the end of 2013, however, because the production process -- encapsulation technology --less than ideal standards, published had to be postponed.

Recently, Taiyuan saving energy leading group release 2013 Taiyuan energy-efficient implementation of the program: the city's main sections will start traffic lights and landscape lights LED lights transformation demonstration project this year.

April 20, Jing Sheng Electrical released announcement about 100,000 per month sapphire cutting and grinding and polishing project feasibility analysis. The project is 100,000 per month sapphire cutting and grinding and polishing, by the Zhejiang Jing Sheng Electrical Co., Ltd. (hereinafter referred to as "Jing Sheng Electrical" or the "Company") construction, mainly produces LED sapphire wafer, put into operation can achieve an annual output of 1.2 million 2-inch sapphire wafer.

Recently, the World Bank funds, mining Wo International Group Epson low-carbon Technology (Beijing) Co., Ltd. co-sponsored by China LED optoelectronic 10 billion industry fund was established in Beijing.

The first quarter of 2013 Kunshan Kunshan Inspection and Quarantine Bureau of Statistics, total exports of 674 batches of LED lamps, the amount of $ 37,150,000, an increase of 12.5% ​​and 36.4%.Mainly exported to Japan, Germany, the United States and Southeast Asia and other countries and regions.

In recent years, an important part of the six strategic emerging industries, Jiaxing, Zhejiang LED industry from scratch, from point to plane, extend the industrial chain constantly growing industrial scale, and has formed a covering sapphire substrate, chip manufacturingdevice package, product application link is relatively complete industrial chain.

Beijing Tourism Committee was recently organized the 2013 Star hotels phase out incandescent promote LED lighting products work will start, and the 2013 star property out of incandescent promote LED lighting products special deployment. The start will be convened, marking the full implementation phase of the work to enter the extension installed.

Graduate of Harvard University established a research team latest design of a "generation football, play football when the kinetic energy produced can be converted into electrical energy, lit indoor small LED lights. Football was called "SOCCKET", a pendulum is provided in its interior, when football rolling pendulum generated the swing gradually gathered energy converted into electrical energy is connected to a rechargeable battery.

The downturn in Europe and the United States and other international market demand for LED lamps, LED products in China, with the price advantage still good prospects in the international market, the 2013 China's LED lighting exports are expected to maintain a growth rate of nearly three years, about 30%.

Point of view from the main product, Chinese exports mainly to package and applied aspects of the product after the early fumble, the domestic LED lighting companies were very active in the international market, and has some outstanding enterprises, export countries, mostly the United States, Germany, the United Kingdom, the Netherlands and South Africa, and the Middle East and other countries and regions.