Abstract
The performances of quantum-dot (QD) based photoluminescent devices are highly restricted by the application environment, especially the moisture and oxygen. However, current external encapsulation structures are not applicable to the devices with discrete QD distribution, especially for some rough profiles. To address this issue, an encapsulation method for discretely distributed quantum-dot arrays (DQDA) is proposed for liquid crystal display (LCD) backlight applications, in which the DQDA can be well fabricated by printing the QD slurry onto a light guiding substrate (LGS), and then covered with a thin UV glue layer and a barrier film. By specially optimizing the UV glue and barrier film, this ultra-thin encapsulation structure cannot only improve the surface defects of the QD morphology without affecting the original light path and the output optical performance, but also significantly suppress the fluorescence decay and isolate moisture and oxygen by almost 100 times compared with unencapsulated one. The water vapor transmission rate (WVTR) was measured to be 1.29 × 10−4 g/m2/day after fabricated the stacked encapsulation structure. After a long period of aging test, the encapsulated sample kept its luminance for 1000 hours. This method also has potential to widely used for discrete structures in other device applications due to its easy fabrication process, high reliability, and low manufacturing costs.
Highlights
Quantum dots (QDs) [1], [2], a kind of advanced nano-materials, have received widespread attention because of their unique photoelectric properties, narrow half peak width, and tunable color, characterized by high color purity and color gamut
An encapsulation method for discretely distributed quantum-dot arrays (DQDA) is proposed for liquid crystal display (LCD) backlight applications, in which the DQDA can be well fabricated by printing the QD slurry onto a light guiding substrate (LGS), and covered with a thin UV glue layer and a barrier film
The composite screen plate was fixed on a printing machine, and the QD slurry was spread on one side of the LGS
Summary
Quantum dots (QDs) [1], [2], a kind of advanced nano-materials, have received widespread attention because of their unique photoelectric properties, narrow half peak width, and tunable color, characterized by high color purity and color gamut. The luminescence and color characteristics of QD-enhanced LCD backlights [3]–[8] can surpass traditional LED backlight using phosphors as light converters [9]–[11], which are comparable to organic light-emitting diode (OLED) [12], [13]. QD based devices are less sensitive to moisture vapor and oxygen than OLED devices [14]–[16], they are still easy to lose efficacy while directly exposed to oxygen and moisture. It is necessary to develop effective encapsulation methods to improve the operation life of QD devices. Current encapsulation methods for QD devices can be concluded into two categories: internal and external encapsulation. Internal encapsulation refers to a series of chemical actions, which
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