We report the optical properties of the blue emitting LED material that belongs to the III-V nitrides family. Quantum wells of InGaN were grown by metal organic chemical vapor deposition. Sapphire was used as the substrate material. Continuous wave and time resolved luminescence experiments were conducted in the temperature range of liquid helium to room temperature. Very intense blue luminescence was observed upto the room temperature. From the very broad linewidth of the emission it was concluded that the compositional fluctuations were dominant. At very low temperatures the lifetimes were found to be somewhat longer than the free exciton case which indicated the localization of excitons at potential fluctuations in the InGaN lattice.
Bibliographical noteFunding Information:
This research is supported by the National Creative Research Initiatives of Ministry of Science and Technology of Korea. One of the authors (A.K.V.) would like to thank the Brain Pool program of Korea for financial support.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Inorganic Chemistry
- Materials Chemistry