UDC 621.382.2
INVESTIGATION OF BLUE-LIGHT DIODES EFFICIENCY IN WHITE LIGHT SOURCES CONTAINING PHOTOLUMINOPHOR
A. E. Chizhikov, Dr. Sc. (Tech.), full professor, RSREU, Ryazan, Russia; This email address is being protected from spambots. You need JavaScript enabled to view it.;
M. I. Galitsyn, master student, RSREU, Ryazan, Russia; This email address is being protected from spambots. You need JavaScript enabled to view it..
The aim of the work is to obtain from the experimental data of blue chip in white light source containing photoluminophor the main parameters of theoretical current-voltage characteristic (CVC) transition and analyze the effect of heating the structure of flowing current on the deviation of experimental CVC from the theoretical one to determine the conditions of the highest relative efficiency of the chip. The results of analytical and experimental studies of chip efficiency – a blue diode on GaN with quantum wells in white light sources TDS-P003L4U10 and BL-L522UWC are given. It is established that the efficiency of the chips depends on transition resistance ratio and structure consecutive resistance, determined by the chip temperature dependent on the current. The effect of chip temperature on the CVC in the range of 20 °С – 180 °С was studied. The most efficient use of supplied current is ensured when the transition resistance in this mode is substantially greater than the consecutive resistance of the structure. It was found that in powerful TDSP003L4U10 the deviation of CVC is caused by the resistance of contact wires connecting the crystal to highcurrent output, and in low-power BL-L522UWC - to the resistance of GaN layers as well as substrate.
Key words: blue led, chip, white led, GaN, relative efficiency, perfect CVC led, heterostructure