P‐11.15: Debut Display of Quantum Dots as on‐chip Photoluminescent Downconverters in LED

Colloidal quantum dots (QD), the material discovered and fostered by laureates of Nobel Prize in Chemistry at 2023, exhibit impressive color purity and light conversion efficiency, are one of the most promising luminescent candidates in wide color gamut display application. Although the QD‐based color conversion techniques are gaining momentum in display industry, integration of QD into LED as on‐chip form still remain to be realized. The allocation of QD layer adjacent to the GaN blue LED light source are considered as the most viable, convenient, and efficient arrangement of adopting QD into photoluminescent scenarios. However, the extremely harsh working conditions QD endured in LED pose immense challenge and barrier to be surmounted. Herein, through bandgap engineering and overgrowth of silica‐aluminum oxide on QD, for the first time, we demonstrate mass‐producible LED chips integrated with QD as photoluminescent color converters via traditional dispensing process. Compared to conventional β‐sialon phosphors, the LED device incorporated with QD show comparable luminous efficacy and reach a wider benchmark of 105.1% NTSC and 98.5% DCI‐P3 color gamut. In addition, our devices exhibit decent lifetime under both working and storage conditions. Typically, while deployed under 60 °C and 90% relative humidity, our 2604 chip charged with a 20 mA working current maintains CIE 1931 color shift within ± 0.015 and luminosity reduction less than 10% after 1000 h continuous run.