By Michael Pecht, Diganta Das, Moon-Hwan Chang (auth.), Clemens J.M. Lasance, András Poppe (eds.)
ISBN-10: 146145090X
ISBN-13: 9781461450900
ISBN-10: 1461450918
ISBN-13: 9781461450917
Thermal administration for LED Applications offers state of the art details on contemporary advancements in thermal administration because it pertains to LEDs and LED-based platforms and their functions. insurance starts with an summary of the fundamentals of thermal administration together with thermal layout for LEDs, thermal characterization and trying out of LEDs, and matters relating to failure mechanisms and reliability and function in harsh environments. Advances and up to date advancements in thermal administration around out the ebook with discussions on advances in TIMs (thermal interface fabrics) for LED functions, advances in compelled convection cooling of LEDs, and advances in warmth sinks for LED assemblies.
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Miller RC, Kleinman DA, Gossand AC (1984) Energy-gap discontinuities and effective masses for GaAs-AlxGa1-xAs quantum wells. Phys Rev B 29:7085 2 Solid-State Physics Fundamentals of LED Thermal Behavior 51 5. Nakamura S, Sench M, Iwasa N, et al (1995) High brightness InGaN blue, green and yellow light-emitting diodes with quantum well structures. Jpn J Appl Phys Lett 34:L797–L799 6. 5P/GaP light-emitting diodes exhibiting >50 external quantum efficiency. Appl Phys Lett 75(16):2365–2367 7. Wierer JJ, Steigerwald DA, Krames MR, O’Shea JJ, Ludowise MJ, Christenson G, Shen Y-C, Lowery C, Martin PS, Subramanya S, Götz W, Gardner NF, Kern RS, Stockman SA (2001) High-power AlGaInN flip-chip light-emitting diodes.
During degradation, LEDs may also undergo gradual shifts in emitted spectra over time and these changes can also affect the maintenance of their luminous flux due to the changes in spectral power distribution. A typical variation of spectra during stress is shown in Fig. 17. The phosphor-related yellow emission decreased with respect to the main blue peak. The yellow component is more affected by thermal treatment than the blue component. A cross-section of the aged device shows that it has a uniform browning of packaging material and degradation took place mainly beyond the chip region (shown in Fig.
11) formula Eq. 12) 26 J. M. Li et al. where I0 is called the saturation current of the ideal diode characteristic. This equation is called the Shockley model of ideal pn-junctions. As the useful LED operation (light emission) takes place under forward bias conditions, the widely used index F is applied in Eq. ” This voltage value is closely related to the bandgap energy of the semiconductor material. The diffusion voltage should satisfy that qVD − Wg + (WF − WV ) + (WC − WF ) = 0. , (WC − WF ) Wg on the n-type side and (WF − WV ) Wg on the p-type side.
Thermal Management for LED Applications by Michael Pecht, Diganta Das, Moon-Hwan Chang (auth.), Clemens J.M. Lasance, András Poppe (eds.)
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