%0 Journal Article %@ 1605-6582 %A Sorokіn, V. М. %A Konakova, R. V. %A Kudryk, Y. Y. %A Zinovchuk, A. V. %D 2012 %F zu2:8347 %I Institute of Semiconductor Physics of Ukraine %J Semiconductor Physics, Quantum Electronics & Optoelectronics %K thermal resistance, light emitting diodes, nitrides %N 12 %P 124-128 %T Technique and setup for diagnostics of p-n junction–package thermal resistance in high-power gallium nitride LEDs %U http://eprints.zu.edu.ua/8347/ %V 15 %X We present a setup and procedure of studying p-n junction–package thermal resistance in high-power light-emitting diodes (LEDs) from their thermal relaxation. A set of LEDs mounted on a metal-core printed circuit board (MCPCB) were studied. The contributions to the total thermal resistance from a heavy heat sink, MCPCB, heat slug and LED chip are separated.