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Green Zone attacked successfully developed Nichia 515 nm laser diode

In Electronic Infomation Category: R | on July   10, 2011

Japanese LED maker Nichia (Nichia) Blu-ray lasers used for the manufacture of GaN substrates, with the improvement of processes and LM119J datasheet and structures, to produce a continuous wave 515 nm wavelength green laser diodes, breaking the previous EL InGaN (InGaN) maintained by the laser wavelength of 500 nm the longest record of the life cycle and LM119J price and moving up to hundreds of hours of the goal.

GaN series of studies in the leading Nichia, 515 nm laser did not provide the reliability of the data, but they made the other models wavelength 510-513 nm laser diodes can operate under the same electrical 500 hours; more than 500 hours, the laser performance will be gradually reduced. Nichia researchers operating current according to a 30% increase compared to the initial value of the defined life of the laser can be estimated that the use of lasers can take up to 5,000 hours.

Nichia team limited use of separate-type heterostructure (separate confinement heterostructure, SCH) laser diode to produce, and LM119J suppliers and their design published in 2001 are almost identical. Through optimized MOCVD process, the thin film deposited on self-AlInGaN (free-standing) c-plane (c-plane) GaN substrate, is to produce green materials with high indium content key.

Nichia team said that they improve the epitaxial layer, in particular multi-layer quantum well (MQW) and the crystal growth conditions, but also improve the high indium content in InGaN active layer of the crystal quality, but did not further optimize the conditions published details. Nichia has previously been published in the wavelength of 488 nm InGaN laser diode, but because of poor crystal quality led to the emergence of non-radiation region in the PL (photoluminescence, PL) analysis of the dark areas under the present. Nichias Takashi Mukai, who pointed out that the design of new devices, these areas have been eliminated.

Room temperature, the wavelength of 515 nm laser diode threshold current and current density were 53 mA and 4.4 kA/cm2. In the operating current of 88 mA, 5.5 V voltage conditions, the output power of 5 mW. The operating wavelength of 510-513 nm laser diodes, at room temperature caused by temperature changes the wavelength of maximum offset of 0.022 nm / K, much smaller than the Osram and Rohm recently launched green laser diodes.

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