• Beauty Bhadra
• Dr. J P Sharma

Quantum Dot Light-Emitting Diodes (QD-LEDs) have emerged as promising candidates for next-generation display and lighting technologies due to their high color purity, tunable emission wavelengths, and superior quantum yield. However, the optimization of their optical performance remains a critical challenge, particularly in relation to external field effects and structural engineering at the nanoscale. In this work, we present a theoretical investigation into the modulation of optical properties in QD-LEDs through systematic control of quantum dot (QD) size, dielectric environment, and the application of external electric fields. By employing the effective mass approximation (EMA) and solving the Schrödinger equation under the influence of a confining potential, we compute the energy eigenvalues and corresponding wave functions for QD structures. The Impact of an applied electric field and impurity doping on the optical transition energies, dielectric function, and oscillator strength is analyzed using the compact density matrix formalism. We examine the linear and third-order nonlinear optical absorption coefficients and evaluate the resonance behavior in various QD configurations. The results indicate a significant redshift in resonance peaks with increasing electric field strength and core radius, while impurity effects introduce localized states that modify transition probabilities. The study reveals that optimized core/shell geometries and appropriate external field control can lead to substantial improvements in light emission efficiency and spectral tunability. These findings provide essential theoretical insights that can guide the experimental design and fabrication of highly efficient QD-based light-emitting devices.

Quantum Dot LED, Optical Properties, Electric Field, Dielectric Function, Effective Mass Approximation, Compact Density Matrix.

"Comprehensive Theoretical Study on the Enhancement of Optical Characteristics in Quantum Dot Light-Emitting Diodes via Structural and External Parameter Modulation", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.12, Issue 11, page no.g59-g64, November-2025, Available :http://www.jetir.org/papers/JETIR2511651.pdf

"Comprehensive Theoretical Study on the Enhancement of Optical Characteristics in Quantum Dot Light-Emitting Diodes via Structural and External Parameter Modulation", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.12, Issue 11, page no. ppg59-g64, November-2025, Available at : http://www.jetir.org/papers/JETIR2511651.pdf