Nichia: LED luminous efficiency increased to 249lm/W
At PhotonicsWest, Japanese LED giant Nichia showed the latest laboratory results, and one of the improved performance LEDs and 3W blue laser diodes attracted widespread attention.
By accelerating the R&D process and increasing the luminous efficiency of LEDs to 249 lm/W @ 20 mA, Nichia developers have captured the LED industry's attention. However, at the PhotonicsWest show held on January 29th this value dropped to 145lm / W @ 350mA, it is clear that 350mA is today's high-brightness LED is commonly used to measure the output power of the drive current. In contrast, Cree and Osram recently announced that the LED luminous efficiency experimental values ​​are 161 lm / W @ 350 mA and 136 lm / W @ 350 mA.
This drop in luminous efficiency due to changing the drive current seems to be unreasonable, and Nichia's Takashi Mukai said that there may be a situation in the process. At first, Mukai theoretically explained that the efficiency limit of white LEDs is 263 lm/W. However, when there is no room for improvement in the efficiency of the audience, he explained that this limit is introduced by introducing a new fluorescent technique Nichia. Increase to above 300lm/W. In addition, it also has a hexagonal sapphire substrate (patented) and a transparent ITO contact layer, similar to the LED products introduced the previous year.
AtsuoMichiue is a colleague of Mukai. He detailed the performance of the buried stripe 445nm laser. It has a dual quantum well active layer and a 15μm2μm emission area. No catastrophic optical damage occurs at output power up to 3W. Power semiconductor lasers are the most common.
The edge transmitter has a threshold current of 185 mA, a power conversion efficiency (WPE) of up to 24.3%, an estimated lifetime of more than 30,000 hours, and a far field beam divergence measurement of 38.2 in the vertical direction and 11.7 in the parallel direction. Some listeners asked if Nichia plans to extend the wavelength of the laser to 488 nm. The other party simply replied that this is the highest secret.
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