Abstract
We demonstrate hybrid white light emitters by employing Gallium Nitride (GaN)-based light-emitting diodes (LEDs) as blue emitters and aggregation-induced emission (AIE) organic molecule 4,7-Bis[4-(1,2,2-triphenylvinyl)phenyl]benzo-2,1,3-thiadiazole (BTPETD) as down-converted yellow emitters. The fabricated device shows CIE coordinates of (0.32, 0.33) and 45.4% optical extraction efficiency from BTPETD layer with pump leakage of 17.3%. At driving current of 30 mA, the highest luminous efficacy of 123.8 lm/W was obtained for the hybrid devices which corresponded a luminance of 1.4 × 105 cd/m2. Our work indicates that formation of aggregates from AIE materials such as BTPETD is able to greatly enhance the device extraction efficiency and improve the hybrid white LED performance.
Highlights
New light sources with high efficiency are always desirable since lighting applications consume about 20% of global energy [1]
Aggregation-induced emission (AIE) organic molecules are another group of organic materials with very high PL quantum efficiencies [14,15].As their name suggests, the aggregation of aggregation-induced emission (AIE) molecules induces the light emission rather than quenches the emission, which means they can be used in high concentration, and makes them good candidates for the hybrid white light emitters
The emission spectrum of light-emitting diodes (LEDs) shows a single peak at 460 nm with a narrow linewidth of 20 nm, and its left shoulder coincides with the absorption tail of BTPETD
Summary
New light sources with high efficiency are always desirable since lighting applications consume about 20% of global energy [1]. The light-emitting diodes (LEDs), which can convert electrical energy directly to light, are considered to be the ultimate lamp, because of their high electroluminescence (EL) efficiencies [2]. Among these LEDs, Gallium nitride (GaN)-based LEDs are almost ideal devices for next-generation white light sources due to their customized direct band-gaps in the ultraviolet to visible spectral range [3]. The properties of hybrid white light emitters with GaN-based LEDs and AIE molecule 4,7-Bis[4-(1,2,2-triphenylvinyl)phenyl]benzo-2,1,3-thiadiazole (BTPETD) are reported. We demonstrated that good performance white light emitting LED can be made in a relatively simple manner by capping the commercial blue GaN LED with an efficient yellow emitting AIE organic compound
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