According to the upper, middle and lower reaches of the LED industry chain, the forum agenda is divided into three special sessions. CTOs and executives from well-known LED industry chains are invited to share the latest cutting-edge technologies in the industry and discuss the upper, middle and lower reaches. Technological development trends.
Figure: 2012 Gaogong LED Exhibition CTO Conference upstream special site
On the afternoon of August 18th, the upstream special session focused on the relationship between light efficiency, mass production and cost. Xue Lei, Assistant General Manager of Zhejiang Yifeng New Energy Technology Co., Ltd. gave a wonderful speech on the theme of “No future without mass productionâ€. He analyzed the current market demand for sapphire substrates, current production capacity and comparison of different production processes and equipment. .
He pointed out that the key to the current sapphire substrate industry is mass production and speed. According to the forecast of about 80 million global sapphire substrates in 2012 and the current progress of domestic sapphire production projects, the sapphire substrate market has been oversupplied. But he said that LED substrates are not the only use of sapphire materials, and smartphones may be a new growth point for the future sapphire material market.
Xue Lei, General Manager Assistant, Zhejiang Yifeng New Energy Technology Co., Ltd.
For the market to continuously release the large-scale sapphire substrate mass production signal, Xue Lei pointed out that the mass production of large-size sapphire crystals is difficult to produce equipment stability, technical workers' proficiency and inherent quality consistency. Cost control needs to test the operator's "choice", that is, the selection and control of raw materials, systems, thermal fields, energy consumption, and manpower.
Yan Chunhui, president of Yaweilang Optoelectronics, analyzed the bottleneck that the upstream can break through. He reviewed the history of the development of nitride LED technology. With the improvement of LM/W, LED applications continue to upgrade and the market continues to expand. The goal of the upstream breakthrough is high luminous efficiency (lm/W) + low cost (lm/$) + high color rendering + high reliability. The prior art is based on increasing lm/W to increase the space of lm/¥+Lm/W, which is close to saturation. For the lighting market, more than 200lm / ¥, lm / W technology is difficult to match.
Yan Chunhui, President of Yaweilang Optoelectronics
Finally, Yan Chunhui proposed the direction of the extension of the square lumens: IEQ improvement, material defects fell into the key; Droop decline, LED structure design, chip heat dissipation is the key; LEE upgrade, LED structure light absorption must be minimized. At the same time, Yan Chunhui also announced the production of near-ultraviolet LED chips by Yaweilang. The internal quantum efficiency has exceeded that of blue LEDs, and the external quantum efficiency is over 50%.
Whether it is important to improve light efficiency or price, Dr. Shao Jiaping, technical director of CREE China, expressed his views. Dr. Shao pointed out that at present, whether to choose multiple low-power integrated or single high-power chips, the choice of different technical routes, the cost performance is different, and the technical solutions are also different, which requires the industry to gather people to discuss together. He believes that the final improvement of light efficiency and technology needs to be close to the market. Different chips have different lighting requirements, and the requirements for lighting drivers are different. The final price/performance ratio is also different.
Dr. Shao Jiaping, Technical Director of CREE China
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