Enhanced thermal conductivity of QDs-polymer film for light-emitting diodes via electrospinning

Abstract

Quantum dots (QDs) have been developed as a promising light-converting material for light-emitting diodes (LEDs). However, QDs-polymer film always shows bad thermal performance. In this paper, a new designed structure of QDs-polymer film via electrospinning was proposed to enhance the thermal conductivity of the QDs-polymer film. After the measurement of density, specific heat and thermal diffusivity, the thermal conductivities of the proposed and traditional QDs-polymer films were calculated and compared. Finite-element simulation was conducted to assess the working temperature when both kinds of QDs-polymer films were packaged in the remote QD-LEDs. Results show that the thermal conductivities in thickness direction and in plane have been enhanced by 64.6% and 423.1% at 25 °C. The highest temperature in QDs-polymer film is decreased from 92.9 °C to 88.0 °C at the driving current of 300 mA.