[Show abstract][Hide abstract] ABSTRACT: Scalability of TRMAR LEDs is investigated in this paper. Both theoretical and experimental results show the optical output power and quantum efficiency scale with the number of cascaded active regions. Temperature distribution image measured by scanning thermal microscope is demonstrated that the two active regions emit light simultaneously. The maximum on-axis luminous intensity of 5 cd of TRMAR LEDs with two active regions was obtained with 15° angle cap.
[Show abstract][Hide abstract] ABSTRACT: The thermal property of tunnel-regenerated multiactive-region (TRMAR) light-emitting diodes (LEDs) is studied in detail in this letter. These devices have the advantages of high quantum efficiency and high output optical power. To obtain the same output optical power, it has been shown that the thermal performance for TRMAR LEDs is much better than that of conventional ones. The heat generated from the reverse-biased tunneling junction in TRMAR LEDs is small and can be neglected as compared with heat produced from the active region as illustrated in scanning thermal microscopy result. An experimental comparison shows that the improved input power dependence on the luminescence intensity proves that TRMAR LEDs have better thermal properties than those of conventional ones.
No preview · Article · Jun 2003 · Applied Physics Letters