Improved blue electroluminescence in InGaN/GaN multiple-quantum well light-emitting diodes with an electron blocking layer

InGaN/GaN multiple-quantum-well light-emitting diodes (LEDs) with p-AlGaN electron blocking layers (EBLs) were grown by using metal-organic chemical vapor deposition. The effects of the EBL thickness on the electrical properties and the luminescent efficiency of the LEDs were investigated by using capacitance-voltage (C-V) measurements, current-voltage (I - V) measurements, electroluminescence (EL), and time-resolved photoluminescence (TR-PL). The EL efficiency of the LEDs increased with increasing thickness of the p-AlGaN EBL. In addition, the EL efficiency of the LEDs also increased with increasing injection current. The carrier lifetime of the LEDs increased with increasing thickness of the p-AlGaN EBL.