Light-emitting device and display panel

A light-emitting device, comprising a light-emitting element that includes an epitaxial structure disposed on a first surface of a substrate, and a distributed Bragg reflector (DBR);

• wherein
• said DBR of said light-emitting element includes:
• a first reflective unit that includes a plurality of first reflective structures stacked on one another, each of said first reflective structures having a first material layer and a second material layer, said first material layers and said second material layers of said first reflective structures being alternately stacked on one another;
• and
• a second reflective unit that is disposed on said first reflective unit and that includes a plurality of second reflective structures stacked on one another, each of said second reflective structures having a first material layer and a second material layer, said first material layers and said second material layers of said second reflective structures being alternately stacked on one another;
• said first material layer of each of said first reflective structures has an optical thickness that differs from that of said first material layer of each of said second reflective structures;
• said second material layer of each of said first reflective structures has an optical thickness that differs from that of said second material layer of each of said second reflective structures;
• said first material layer of each of said first reflective structures and said second reflective structures has a refractive index that differs from that of said second material layer of each of said first reflective structures and said second reflective structures;
• said DBR of said light-emitting element further includes a third reflective unit that is disposed on said second reflective unit opposite to said first reflective unit and that includes a plurality of third reflective structures stacked on one another, each of said third reflective structures having a first material layer and a second material layer that are stacked on one another, said second material layer of each of said third reflective structures having an oxygen content less than that of said second material layer of each of said first reflective structures and said second reflective structures;
• and
• said second material layer of each of said first reflective structures and said second reflective structures includes a TiO2 layer;
• said second material layer of each of said third reflective structures includes a TiOn layer, where n ranges between 1.7 and 1.95.

A light-emitting device, comprising a light-emitting element that includes an epitaxial structure disposed on a first surface of a substrate, and a distributed Bragg reflector (DBR);

• wherein
• said DBR of said light-emitting element includes:
• a first reflective unit that includes a plurality of first reflective structures stacked on one another, each of said first reflective structures having a first material layer and a second material layer, said first material layers and said second material layers of said first reflective structures being alternately stacked on one another;
• and
• a second reflective unit that is disposed on said first reflective unit and that includes a plurality of second reflective structures stacked on one another, each of said second reflective structures having a first material layer and a second material layer, said first material layers and said second material layers of said second reflective structures being alternately stacked on one another;
• said first material layer of each of said first reflective structures has an optical thickness that differs from that of said first material layer of each of said second reflective structures;
• said second material layer of each of said first reflective structures has an optical thickness that differs from that of said second material layer of each of said second reflective structures;
• said first material layer of each of said first reflective structures and said second reflective structures has a refractive index that differs from that of said second material layer of each of said first reflective structures and said second reflective structures;
• and
• said second reflective unit includes at least three of said second reflective structures, and, in said second reflective unit, a difference in the optical thickness between one of said first material layers having a greatest optical thickness and one of said first material layers having the least optical thickness is no smaller than 60 nm.