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the LED is not visible The vigorous development of fiber-optic communications and infrared wireless data transmission applications considerable future market growth

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The light-emitting diode (LED / Light Emitting Diode) is a light-emitting element made of semiconductor materials, with small size, long life, electricity-saving and fast reaction rate, good shock resistance and less pollution, etc., in line with the world’s light, thin, short, small, Pets trend of demand, has become very popular in the daily life products and applications and the market is expanding, such as automotive, communications, industrial, computer, traffic signs, displays, etc., In addition, the LED is not visible The vigorous development of fiber-optic communications and infrared wireless data transmission applications, considerable future market growth.

The world’s first LED products in 1968, the compound semiconductor crystal growth technology is mature, HP’s first use made of GaAsP yellow LED, most of the products used in watches and calculators, but because of its luminous efficiency is too low, can not universal; followed by technology breakthrough, brightness continued to improve, Nichia Corporation of Japan in 1993 the successful development of the blue LED, full color LED products can be achieved. Due to the advantages of LED low power consumption and high life, and gradually open the LED applications, the price will be due to the scale of demand and production technology improvement, continued to fall, will gradually replace the incandescent lamps and fluorescent lamps, and because of its small size, power consumption, long life and other characteristics, the introduction of a variety of new applications will drive the amount of LED products.

Lighting equipment, for example: incandescent light bulbs, fluorescent lamps, halogen lamps, and display, such as: TV, computer, mobile phone screen, are supplies of modern life can not be replaced. In the 21st century, people will need more in line with demand for optoelectronic products. In recent years, light-emitting diode (LED) has successfully replaced traditional light source lighting and decorative tools, the expected future demand will continue to grow. Display from the traditional cathode ray tube, into a liquid crystal display (LCD), has continued to reduce manufacturing costs, use is also becoming more diversified and more widespread, with better performance.

Because of the advantages of the LED, especially in the energy and environmental protection, the United States, Japan, the European Union rests with the official establishment of the project, the preparation of the budget and plan the implementation of LED power consumption is only about 10% of the traditional light bulb, global lighting electricity accounts for about 20% of the total electricity, Taiwan If you LED to replace traditional light sources, it saves about a nuclear power plant electricity each year, the Taipei City Government, for example, in order to comply with the “economy”, “save” and “environmental protection” principle, Taipei City traffic control works in June 2000 took the lead in the benevolence, Guangfu South Road pilot LED signal lights face daily power consumption from the original incandescent bulbs become 10 degrees 55 degrees, 80% electricity savings in Taipei 1,650 at Signalized Intersections to calculate the annual saving of about $ 2,710 million kWh.

First, the development of blue phosphorescent osmium complexes synthesis and photophysical properties. Blue phosphorescent molecules need to be excited to a high-energy “triple excited state, will accelerate the luminescence decay (Radiationless decay), so the quantum efficiency than green, red phosphorescent. Week, quarter Professor overcome obstacles, to produce high-efficiency blue phosphorescent osmium complexes. In addition, these blue phosphorescent material can also be used in the manufacture of white organic light-emitting diodes as a general lighting source.

Second, the development of high efficiency, pure red phosphorescent osmium complexes. OLED element of this type of phosphorescent material prepared at low current density state to 1 mA/cm2, the external quantum efficiency of up to 20%, beyond the traditional red phosphorescent iridium material. Chemically modified, light color can also be changed to the color of orange light, and for the preparation of the blue, orange double light color “white OLED element in total structure, in theory, can be used as the general indoor lighting.

Third, the development of blue phosphorescent iridium are complexes. This research work is the prosthetics osmium complexes weaknesses in terms of stability, and Academia Sinica Dr. Chen Jinde in innovation and R & D of the new host material (host Materials), be superior output efficiency blue phosphorescent OLED element, also continuous improvement of the device efficiency.

, With Jiaotong University, Professor Xu Qingfeng in the polyethylene bromodiphenylfluorene (polyflourene) aspects, by the introduction of the dual nature of the functional group, balance of electronic and electrical hole of transfer capacity, and reduce the molecular excited states interact stack can be power-induced light by The green to pure blue. In addition, after the Add osmium phosphorescent complexes can also be emitted light turns red. In this paper, who have been leading international materials Monthly Materialstoday results column.

Put forward the concept of of a photosensitizing medical treatment (photodynamic therapy): the gene sensing molecules with phosphorescent material to nano quantum dots (QDs), to be completed, you can recognize the tumor gene sensing molecules Organizations, the quantum dots selective adsorption at the surface of the tumor tissue to achieve the purpose of identification. Recycling the light to generate singlet oxygen molecules, and destruction of tumor tissue, in order to replace the surgical resection or radiation therapy method.

Development photosensitive solar dye: week, quarter Professor joint team will also be part of the resources into the research and development of new photosensitive dye solar cell production as the goal. Preliminary photosensitive solar cell conversion efficiency of up to 6%, and possessed considerable stability. Best combination of chemical modification and nano substrate, it is expected that the performance can be gradually increased to 10%, will be of great potential for development.

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