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<p>In this work, we investigate the effect of thermal annealing under ambient conditions on the structural, optical, electrical and morphological properties of nano-crystalline tris(8-hydroxyquinolinato)aluminum (Alq₃) thin films and their impact on the performance of flexible yellow and green organic light-emitting diodes (OLEDs) and solid-state lighting devices. Nano-crystalline Alq<sub>3</sub> thin films under ambient conditions were deposited on ITO-based flexible substrates using spin coating technique and subsequently annealed at various temperatures(room temperature-200&#xa0;°C) to optimize their crystallinity and emission characteristics. X-ray diffraction (XRD) and scanning electron microscopy analyses reveal enhanced crystallinity and controlled surface morphology with increasing annealing temperature particularly at 150&#xa0;°C, leading to improved charge transport and photoluminescence properties and formation of emissive polymer Al(8-Hq-N-O)<sub>3</sub>[tris(8-hydroxyquinoline-N-oxide)aluminum(III)]. Optical studies show a significant enhancement in the emission intensity and a desirable shift in the photoluminescence spectrum suitable for white light generation. Prototype flexible green and yellow OLEDs incorporating the optimized Alq₃ thin films demonstrate low turn on voltage of 2.8&#xa0;V and improved luminance efficiency of 6338.6&#xa0;cd/m<sup>2</sup>, color stability with CRI 98 and EQE of 1.48%, indicating their promising potential for next-generation flexible displays and energy-efficient solid-state lighting. These findings highlight the crucial role of thermal annealing in tailoring the microstructure of organic emissive layers to achieve high-performance, flexible optoelectronic devices.</p>

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Thermally annealed nano-crystalline Alq3 thin films for yellow and green OLED solid-state lighting application

  • 期刊论文

  • 发表日期：

    2025年11月17日

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  • Mrinmoy Debsharma,
  • Tanay Pramanik,
  • Amit Ranjan Maity,
  • Partha Sona Maji,
  • Alok Jain,
  • Rupam Mukherjee

摘要

In this work, we investigate the effect of thermal annealing under ambient conditions on the structural, optical, electrical and morphological properties of nano-crystalline tris(8-hydroxyquinolinato)aluminum (Alq₃) thin films and their impact on the performance of flexible yellow and green organic light-emitting diodes (OLEDs) and solid-state lighting devices. Nano-crystalline Alq3 thin films under ambient conditions were deposited on ITO-based flexible substrates using spin coating technique and subsequently annealed at various temperatures(room temperature-200 °C) to optimize their crystallinity and emission characteristics. X-ray diffraction (XRD) and scanning electron microscopy analyses reveal enhanced crystallinity and controlled surface morphology with increasing annealing temperature particularly at 150 °C, leading to improved charge transport and photoluminescence properties and formation of emissive polymer Al(8-Hq-N-O)3[tris(8-hydroxyquinoline-N-oxide)aluminum(III)]. Optical studies show a significant enhancement in the emission intensity and a desirable shift in the photoluminescence spectrum suitable for white light generation. Prototype flexible green and yellow OLEDs incorporating the optimized Alq₃ thin films demonstrate low turn on voltage of 2.8 V and improved luminance efficiency of 6338.6 cd/m2, color stability with CRI 98 and EQE of 1.48%, indicating their promising potential for next-generation flexible displays and energy-efficient solid-state lighting. These findings highlight the crucial role of thermal annealing in tailoring the microstructure of organic emissive layers to achieve high-performance, flexible optoelectronic devices.