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17th International Workshop on the Physics of Semiconductor Devices,Amity University Uttar Pradesh, India, 09-13.12.2013тезисы доклада
- Автор: Yunovich A.E.
- Сборник: Abstracts of the 17th International Workshop on the Physics of Semiconductor Devices (17th IWPSD)
- Том: 1
- Тезисы
- Год издания: 2013
- Место издания: Amity University Uttar Pradesh, India
- Первая страница: 247
- Последняя страница: 247
- Аннотация: Semiconductor compounds GaN, InN, AlN and their alloys have hexagonal crystallografic lattice and energy gap from 0.7 to 5.6 eV. Their electrical and optical properties were initially studied in the middle of XX century, but a boom of their research began in the 90th years after inventions of superbright blue LEDs and lasers. Problems of technology of III-Nitrides. Molecular-beam and metallo – organic epitaxy. Substrates: Sapphire, Silicon Carbide, Silicon. Homo- epitaxial substrates: GaN, AlN - polar, semi- polar and non- polar crystal orientations. Dislocations during epitaxial growth: from 10^10 cm^-2 to 10^8 and to 10^4 cm^-2. Nano- heterostructures for LEDs. Problems of p-type doping. First structures with one quantum well (QW), multiple quantum wells (MQWs); complicated structures with superlattices. Spontaneous and piezoelectric polarization; doping barriers. Quantum efficiency (QE) of LEDs: electrical efficiency (injection coefficient, series and parallel resistance), internal efficiency of radiative recombination, coefficient of optical extraction, external quantum efficiency, power efficiency. Spectral dependence of GaN- based LEDs. Maximum of QE for blue LEDs. Problem of QE at high currents (efficiency droop). Problems of QE for green and yellow LEDs, for UV LEDs. Constructions of chips and primary optics for LEDs. Simulation of LED's constructions. White LEDs. Spectral sensitivity of human eyes and luminous efficiency. Various types of white light LED emitters; “cold”, “natural” and “warm” light. Phosphors for white LEDs. Luminous efficiency, color indexes, color temperature. Luminous efficiency of white LEDs in perspective and predictions. LEDs for modern and future lighting. Energy economy, benefits of LEDs lighting. Problems of applications of LEDs lighting – standards, safety, concurrence with lamps, state politics, public opinion.
- Добавил в систему: Юнович Александр Эммануилович