Abstract
White light-emitting diodes (WLEDs) based on quantum dots (QDs) are gaining increasing attention due to their excellent color quality. QDs films with planar structure are universally applied in WLEDs for color conversion, while they still face great challenges in high light extraction and thermal stability. In this study, a QDs film with a spherical shell structure was proposed to improve the optical and thermal performance for WLEDs. Compared with the conventional planar structure, the luminous efficacy of the QDs spherical shell structure is improved by 12.9% due to the reduced total reflection effect, and the angular-dependent correlated color temperature deviation is decreased from 2642 to 283 K. Moreover, the highest temperature of the WLED using a QDs spherical shell is 4.8 °C lower than that of the conventional WLED with a planar structure, which is mainly attributed to larger heat dissipation area and separated heat source. Consequently, this QDs spherical shell structure demonstrates superior performance of QDs films for WLEDs applications.
Highlights
White light-emitting diodes (WLEDs) have attracted significant attention as superior light sources due to their low cost, high luminous flux, low energy consumption, and ecological environment protection [1]
A WLED is obtained by combining yellow phosphor with a blue light-emitting diode, such as a Yttrium Aluminum Garnet (YAG) phosphor [10]
After combination with blue or ultraviolet (UV) LEDs, the quantum dots (QDs) have been packaged in silicone as a planar film for LED applications, creating a white light with the desired color temperature [18,19]
Summary
White light-emitting diodes (WLEDs) have attracted significant attention as superior light sources due to their low cost, high luminous flux, low energy consumption, and ecological environment protection [1]. A WLED is obtained by combining yellow phosphor with a blue light-emitting diode, such as a Yttrium Aluminum Garnet (YAG) phosphor [10]. This traditional phosphor, possessing a narrow excitation width and broad full width at half maximum (FWHM) of about 100 nm [11], is suboptimal for WLEDs design. After combination with blue or ultraviolet (UV) LEDs, the QDs have been packaged in silicone as a planar film for LED applications, creating a white light with the desired color temperature [18,19]. Like the phosphor WLED, the QDs package used for WLEDs fabrication still requires improvements for achieving higher luminous efficacy [23]
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