1. LUMINOUS! Center of Excellence for Semiconductor Lighting and DisplaysTPI‐The Photonics InstituteSchool of Electrical and Electronic EngineeringNanyang Technological University Singapore 639798 Singapore
2. School of Chemical EngineeringUniversity of Science and Technology Liaoning Anshan 114051 P. R. China
3. Division of Physics and Applied PhysicsSchool of Physical and Mathematical SciencesNanyang Technological University Singapore 639798 Singapore
4. Department of Electrical and Electronics EngineeringDepartment of PhysicsUNAM‐Institute of Materials Science and NanotechnologyBilkent University Ankara 06800 Turkey