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Related Concept Videos

Photoluminescence: Applications01:14

Photoluminescence: Applications

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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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The operation of a p-n junction diode involves various biasing conditions, including forward bias, reverse bias, and equilibrium.
In equilibrium, no external voltage is applied across the p-n junction. The depletion region is formed at the junction interface due to the diffusion of carriers, which leaves behind charged dopants, acceptors on the p-side, and donors on the n-side. These immobile charges create an electric field that prevents further diffusion of carriers. The related energy band...
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Glass-Based 4-in-1 High-Voltage Micro-LED Package for High-Brightness Mini-LED Backlight Applications.

Chien-Chi Huang1,2, Tzu-Yi Lee1,2, Chia-Hung Tsai1,3

  • 1Department of Photonics, College of Electrical and Computer Engineering, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan.

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|December 10, 2025
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Summary
This summary is machine-generated.

A novel MicroLED-in-Package (MiP4) architecture integrates four micro-LEDs for high-voltage applications. This innovative design offers superior optical power and luminous flux density, enabling brighter, more efficient displays and optical systems.

Keywords:
MicroLED-in-Package (MiP4)glass substrate packagingredistribution layer (RDL)

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Area of Science:

  • Optoelectronics
  • Semiconductor Devices
  • Materials Science

Background:

  • MicroLED technology is advancing for display and communication applications.
  • High-voltage driving circuits for MicroLEDs often require complex converters.
  • Transparent substrates offer advantages in light extraction and thermal management.

Purpose of the Study:

  • To demonstrate a novel four-in-one (4-in-series) MicroLED-in-Package (MiP4) architecture.
  • To evaluate the performance of the MiP4 device for high-voltage applications.
  • To assess the potential of this architecture for next-generation displays and optical systems.

Main Methods:

  • Integration of four sub-85 µm blue micro-LED dies on a transparent glass substrate using redistribution-layer (RDL) interconnection.
  • Electrical and optical characterization of dual-, triple-, and quad-chip devices.
  • Pulse-driven measurements to assess thermal stability and spectral shift.

Main Results:

  • The MiP4 device operates natively at 16 V, simplifying driving circuits.
  • Achieved 1.8× higher optical power and 64 lm/mm² luminous flux density compared to a commercial LED.
  • Demonstrated excellent thermal stability and minimal spectral shift (<1 nm) under pulsed operation.

Conclusions:

  • The 4-in-1 high-voltage glass-based µ-LED package is a scalable and manufacturable solution.
  • This architecture enables ultra-thin, high-brightness Mini-LED backlights.
  • The MiP4 technology is suitable for advanced optical communication systems.