Efficiency Enhancement of Blue InGaN Light-Emitting Diodes With Shallow First Well

Enhancement of efficiency of InGaN-based light emitting diodes through strain and piezoelectric field management

“…Solid State lighting, displays, laptop and television back lighting, blue-ray players, pico-projection systems, traffic signal, and automotive applications are a few of the applications which have caused considerable interest in the development of InGaN-based light emitting diodes (LEDs). [1][2][3][4][5][6][7][8][9][10] Continuing improvements in the performance of the InGaN emitters, particularly for green LEDs, are required in order to achieve the full market potential of InGaN-based emitters. One of the major factors limiting the light output power is the presence of in-built polarization fields that originate from the wurtzite crystal structure of III-N semiconductors.…”

Spectral competition of chirped dual-wavelength emission in monolithic InGaN multiple-quantum well light-emitting diodes

“…Since the sequence of the QWs with high and low indium contents largely affects the dual-wavelength emission from the stacked QWs in the active region due to serious band-bending phenomenon induced by the hetero-interfaces between the GaN-InGaN layers, the green-violet chirped LED and violet-green chirped LED are compared with reversed sequence. 24,25 Another dual-wavelength LED, which refers to the staggered structure proposed by Long et al, is served as a strain-reduced LED in this work. 26 Moreover, a broad-band LED with a shallow first well, which plays the role of prestrain layer or electron reservoir layer, is also explored and compared.…”

“…26 Moreover, a broad-band LED with a shallow first well, which plays the role of prestrain layer or electron reservoir layer, is also explored and compared. [16][17][18]24 For the exploration of spectral competition between the green and violet emissions, the spontaneous emission rates as a function of wavelength for the four LEDs under study at 20, 100, 180, and 260 mA are depicted in Fig. 2.…”