Abstract
Ultraviolet light-emitting diodes (UVLED) are a new type of device in the LED development; however, the radiant efficacy of UVLEDs is still too low to satisfy the requirements of applications. In this study, boron nitride nanoparticles (BN NPs) are incorporated into the UVLED’s silicone encapsulation to improve the optical output power. This BN NPs-based package shows an increase in optical flux of 8.1% compared with silicone-only encapsulation when the BN NP concentration is optimized at 0.025 wt%. By analyzing the BN NP film, adding the BN NPs into silicone leads to a decrease in transmittance but an increase in haze. Haze and transmittance has an excellent negative correlation with increasing BN concentration under 365 nm. The moderate BN NP concentration maximizes the scattering performance from haze while maintaining high transmittance. Therefore, this enhanced light output is attributed to scattering that reduces optical losses from total internal reflection at the silicone–air interface. By using the new BN-based structure in green and red quantum dot devices, an increase radiant flux of the device is observed, 9.9% for green LED and 11.4% for red LED. This indicates that BN NPs have potential prospects in the application of UV LEDs used as excitation sources for quantum dots.
Highlights
Light-emitting diodes (LEDs) have shown a surprising rate of development as a fundamental device for solid-state illumination and display [1,2,3]
We studied the role of introducing ZnO NPs into the silicone encapsulation of a quantum dot blue-LED application and found that the luminous flux was increased by 3.37% by adding a small amount of the ZnO NPs [20]
The emission spectrum showed that the red LED had both the 367 nm purple and the 636 nm red peaks
Summary
Light-emitting diodes (LEDs) have shown a surprising rate of development as a fundamental device for solid-state illumination and display [1,2,3]. Besides application in the visible spectrum, the LED has extended into the ultraviolet (UVLED) [4,5]. By inheriting the advantages of LED such as small size, low cost, long life, and ecological environment protection, the UVLED is considered as one of the best choices to replace the traditional gas ultraviolet light source by eliminating a source of mercury pollution [6,7,8]. The UVLED exhibits outstanding prospects for application in ultraviolet illumination, displays, ultraviolet curing, anti-counterfeiting detection, and sterilization [9]. The UVA LED is likely to be the first to achieve commercialization
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