Estimation the Amount of Heat Generated by LEDs under Different Operating Conditions

Highly Stable White Light Emission from III-Nitride Nanowire LEDs Utilizing Nanostructured Alumina-Doped Mn4+ and Mg2+

“…The detailed descriptions of the MBE growth and device fabrication of our nanowire LEDs can be found in our previous publications. 8 − 14 …”

“…After being grown by MBE, the nanowire LED samples were fabricated using standard fabrication processes. The detailed descriptions of the MBE growth and device fabrication of our nanowire LEDs can be found in our previous publications. − …”

“… 8 − 13 In addition, luminous efficacy of the LEDs can attain 50 to 70% of the theoretical maximum. 14 More than 30% of the energy is converted into heat which reduces the LED luminescent efficacy and lifetime. Recently, high-color rendering index (CRI) micro-white LEDs have been fabricated including blue-emitting InGaN-nanowire devices and red-emitting fluoride nanophosphors.…”

“…Nanostructured III-nitride materials have attracted significant attention due to their great potential applications in micro-displays, conformable light sources, and augment/virtual reality technology. The light-emitting diodes (LEDs) that could emit different wavelengths from ultraviolet (UV), visible light, and infrared (IR) by controlling the In, Ga, and Al composition in In­(Al)­GaN materials are intensively investigated. − However, the fabrication of high-efficiency full-color LEDs, especially at long wavelengths (green and red light), remains a challenge that hinders the commercial availability of micro-displays. − In addition, luminous efficacy of the LEDs can attain 50 to 70% of the theoretical maximum . More than 30% of the energy is converted into heat which reduces the LED luminescent efficacy and lifetime.…”

Study of temperature and performance for LED devices with white emission

“…In the case of lamps, the application of LEDs has been most efficient, because they offer lower energy consumption and more economy spending less energy 10,11,12 . In addition, LED lamps have many other advantages, such as 13,14,15,16 Despite the white LEDs present good characteristics as previously mentioned, the maximum efficiency has been limited by heat sink generated that is dependent also by design of the lamp 17 . LEDs with white emission still have low efficiency transforming 20 to 30% of the input power into visible light and the remaining part 70 to 80% into heat and the lumen-depreciation values are very much dependent on what temperature the chip's junction reaches in its application 18 .…”