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Remarkable decrease in threshold for electrically pumped random ultraviolet lasing from ZnO film by incorporation of

Yunpeng Li1, Xiangyang Ma, Mingsheng Xu

  • 1State Key Laboratory of Silicon Materials and Department of Materials Science and Engineering, Zhejiang University, Hangzhou, China.

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Incorporating zinc titanate nanoparticles into zinc oxide films significantly lowers the threshold current for electrically pumped random lasing (RL). This advancement offers a promising strategy for developing efficient, low-threshold random lasers.

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Nanotechnology

Background:

  • Random lasing (RL) is a phenomenon with applications in lasers, sensors, and imaging.
  • Metal-insulator-semiconductor (MIS) structures are widely used in optoelectronic devices.
  • Zinc oxide (ZnO) is a promising semiconductor material for optoelectronic applications due to its wide bandgap and exciton binding energy.

Purpose of the Study:

  • To comparatively investigate electrically pumped random lasing (RL) actions in two MIS-structured devices.
  • To explore the effect of incorporating Zn2TiO4 nanoparticles into ZnO films on RL characteristics.
  • To identify strategies for developing low-threshold ZnO-based random lasers.

Main Methods:

  • Fabrication of two MIS-structured devices with different light-emitting layers: pure ZnO and Zn2TiO4-nanoparticle-incorporated ZnO.
  • Characterization of electrically pumped random lasing (RL) properties, focusing on threshold current.
  • Analysis of light scattering properties influenced by nanoparticle incorporation.

Main Results:

  • The device with Zn2TiO4-nanoparticle-incorporated ZnO exhibited a significantly lower threshold current for electrically pumped RL compared to the pure ZnO device.
  • The enhanced multiple light scattering due to Zn2TiO4 nanoparticle incorporation was identified as the primary reason for the reduced threshold current.
  • The findings demonstrate the potential of nanoparticle incorporation to improve random lasing performance.

Conclusions:

  • Incorporating Zn2TiO4 nanoparticles into ZnO films is an effective strategy to reduce the threshold current for electrically pumped random lasing.
  • This approach enhances light scattering, leading to more efficient random lasing.
  • The study provides a pathway for developing advanced, low-threshold ZnO-based random lasers for various applications.