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Structural optimization for remote white light-emitting diodes with quantum dots and phosphor: packaging sequence

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This summary is machine-generated.

The packaging sequence of quantum dots (QDs) and phosphors significantly impacts white light-emitting diodes (WLEDs). QDs-on-phosphor WLEDs offer superior luminous efficiency, color rendering, and lower operating temperatures compared to phosphor-on-QDs designs.

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Area of Science:

Optoelectronics
Materials Science

Background:

White light-emitting diodes (WLEDs) utilize quantum dots (QDs) and phosphors for enhanced color rendering.
Packaging strategies are crucial to mitigate reabsorption losses and maintain QD stability.

Purpose of the Study:

To investigate the impact of packaging sequence (QDs-on-phosphor vs. phosphor-on-QDs) on WLED optical and thermal performance.
To determine the optimal architecture for improved WLED efficiency and color quality.

Main Methods:

Fabrication and optical characterization (output power, PL spectra) of WLEDs with different packaging sequences.
Thermal simulation and experimental validation using infrared thermography.

Main Results:

QDs-on-phosphor WLEDs achieved 110 lm/W luminous efficiency, Ra=92, R9=80.
Phosphor-on-QDs WLEDs showed lower performance: 68 lm/W luminous efficiency, Ra=57, R9=24.
QDs-on-phosphor WLEDs exhibited a lower maximum temperature by up to 12.3°C.

Conclusions:

The QDs-on-phosphor packaging sequence is optimal for WLEDs.
This architecture enhances optical efficiency, color rendering, and thermal management.