Two kinds of multi chip white LED hit a new record of lumen efficiency

According to the National Bureau of standards and technology NIST report, 18W warm white LED and 72W neutral white LED can achieve 77.4lm/W and 89.8lm/W lumen efficiency.

University of California-Irvine optoelectronics packaging and materials laboratory announced the development of its warm white and neutral white multi chip LED are a new record of lumen efficiency. Two kinds of LED are used in commercial blue chip. December 2008 National Institute of standards and Technology (NIST) report confirms the performance of the above two kinds of LED. The above results are measured after the LED and the heat balance of the radiator reached 37 degrees celsius.

According to the laboratory of Shi Guojun (Frank Shi) Professor (e-mail: fgshi2000@yahoo.com; fgshi@uci.edu), innovation obtains above results from packaging design, packaging technology, packaging materials of white LED fluorescent powder and process optimization, rather than by any special prototype chip.

18W warm white LED

According to the report of NIST, the input power of the multi chip package warm white light LED is 18.62W, and the luminous flux is 77.4 lm/W, and the luminous flux is equal to 3928K, and the luminous flux of 1444lm can be produced, which is the lumen efficiency of.

The above results are measured after the LED and the heat balance of the heat sink are up to 37 degrees celsius. If the LED junction temperature is maintained at 25 DEG C in accordance with the general industry standard, lumen efficiency is expected to be 82lm/W.

The white light LED chip used in the Blu ray chip optical power is 260mW. However, according to the information of a large LED chip manufacturers, blue chip bare chip optical output power up to 571mW. Therefore, if the existing packaging technology and white LED technology used in this 571mW blue chip, lumen efficiency is expected to reach 170lm/W.

72W neutral white LED

According to the NIST report, multi chip integrated compact white LED in the 72.84W input power, can produce the relevant color temperature of 4455K luminous flux of 6543lm, the lumen efficiency of 89.8lm/W.

The above results are also measured after the LED and the heat balance of the radiator reached 37 degrees celsius. If the LED junction temperature is maintained at 25 DEG C in accordance with the general industry standard, lumen efficiency is expected to be 95lm/W.

The white light LED chip used in the Blu ray chip optical power is 260mW. If the existing packaging technology and white light LED technology applied to the blue chip 571mW, lumen efficiency is expected to reach 197lm/W.