Dr. Haider is a postdoctoral researcher at the School of Materials and Energy, Yunnan University, China. He received his Ph.D. in Materials Physics and Chemistry from Kunming University of Science and Technology. His research focuses on rare-earth-doped inorganic luminescent materials, defect-engineered photophysics, energy-transfer mechanisms, photochromic phosphors, white-light-emitting diodes, optical information storage, and anti-counterfeiting applications. He has authored or co-authored approximately 50 SCI-indexed publications and contributed to seven Chinese invention patents, including two granted patents. He also serves as a reviewer for more than 25 international journals. His current work emphasizes structure–property relationships and the rational design of multifunctional luminescent materials for lighting, sensing, imaging, and optical-security technologies.