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Japanese company doubles diode panel's life span


Japanese company doubles diode panel's life span

TOKYO, Oct. 13 (Xinhua) -- A Japanese chemical company has developed an organic light-emitting diode (OLED) panel with a life of 30,000 hours, twice that of conventional OLED panels. The new longer-life OLED module has a range of uses in offices, households and medical facilities.

Mitsubishi Chemical Corporation (MCC), a subsidiary of the Mitsubishi Chemical Holdings Corporation, changed the composition of the panel's materials, solving one of the major drawbacks of OLED lighting products, a short lifetime due to rapid deterioration, the Nikkei reported on Monday.

The Tokyo-based company started shipping sample products to lighting equipment makers in early October, and planned to step up marketing efforts in order to widen the scope of commercial application for its OLED technology to include products for offices, households and medical institutions.

In March, MCC started selling OLED lighting modules made with a "wet coating process" for the light-emitting layer.

But these modules, which were jointly developed with Pioneer, have a life span of only 15,000 hours, and lighting makers asked for more durable products. In just six months, the chemical maker was able to give them what they wanted.

The basic principle of OLED lighting is rather simple.

Electricity generates a positive and negative holes and electrons between the electrodes of an OLED panel.

These are attracted to each other in the light-emitting layer and, upon contact, annihilation occurs, generating massive energy and light.

This process causes damage to the light-emitting layer and the electrodes, however, causing the module to degrade over time.

To remedy this, MCC replaced the materials of the panel with stronger ones and tweaked the entire structure. These steps have slowed the pace of deterioration and prolonged the life of the product, according to the company.

An OLED lighting panel emits light from its entire surface, in contrast with light-emitting diode (LED) and fluorescent lighting, which emit light from a single point or line. This results in more natural-looking light with less glare.

The new module emits light with a color temperature of about 3, 000 K, which means the light appears similar to that from an incandescent or fluorescent bulb.

Given these strengths, the company plans to market the new panels for a wide range of applications. In offices, they can be used to create more work-friendly desk lighting, while in the home they can provide warm lighting for living rooms and bedrooms, or be used in lighted bathroom mirrors.

OLED lighting can also be used in hospitals to help patients feel more relaxed and comfortable.

The new product will be manufactured by Pioneer OLED Lighting Devices, a Pioneer subsidiary, and sold by MC Pioneer OLED Lighting, a joint marketing venture of Mitsubishi Chemical and Pioneer.