Improving the luminous efficiency of quantum dot-converted LEDs by doping boron nitride nanoparticles

Quantum dot-converted LEDs (QCLEDs) are a new type of LED device. However, the low luminous efficiency of the QCLED cannot meet the requirements for practical applications. In this study, boron nitride nanoparticles (BN NPs) were doped into the quantum dot color convertor (QCC) of QCLEDs to utilize their strong scattering ability. Through many experiments, we found that as the concentration of BN NPs increased, the blue-light radiation flux decreased monotonically. Meanwhile, the luminous flux and efficiency of the BN-doped QCLEDs showed a 28.18% increase compared to the conventional structure when the BN NP concentration was 0.25 wt%. At the same time, with the increase in the BN NPs, the correlated color temperatures (CCTs) decrease to the range of 2000–3000 K warm white light, and the color coordinates of the devices gradually move to the yellow region. To conclude, doping low-concentration BN NPs in the quantum-dot color convertor (QCC) without excessively affecting the radiation flux of the device is an ideal solution. In addition, QDs are still very expensive, and reducing the amount of QDs in QCLEDs by doping BN NPs and improving the luminous flux and efficiency of QCLEDs has strong application prospects.