Fig. 5From: Enhanced Performance of AlGaN-Based Deep Ultraviolet Light-Emitting Diodes with Chirped Superlattice Electron Deceleration LayerThe relative LOP as a function of the aging time for all the samples at 20 mA and room temperature. The aging is stopped when the relative LOP is under 50%. Black, red, green, and blue curves represent samples a, b, c, and d, respectively. The lifetime for sample D with ascending Al-content chirped SEDL is over 10,000 h at L50Back to article page