Peak emission wavelength tuning for Light Emitting Diodes and lasers for InGaN — deltaInyGa1−yN Quantum Well by varying the composition of the delta well

Four InGaN-deltaIn
y
Ga
1−y
N Quantum Wells (QW) with four different values of y (1, 0.9, 0.8, 0.7) were investigated through the numerical solution of a k.p Hamiltonian with the Finite Difference Method (FDM). The spontaneous emission spectra and optical gain spectra of the four structures have been found to have a definite pattern where increasing the value of y gradually shifted the spectra toward the higher energy regions. The electron-hole ground state overlaps were not found to change by a great amount. Increasing y brought about a predictable shift of the spectra toward the higher energy regions at the expense of electron-hole wave function overlap.