Abstract
In this report, a blue anti-transmission film (BATF) has been introduced to improve the color-conversion efficiency (CCE) and the stability of quantum dot (QD) films. The results indicate that the CCE can be increased by as much as 93% using 15 layers of BATFs under the same QD concentration. Therefore, the same CCE can be achieved using BATF-QD hybrid films with a lower QD concentration when compared with standard QD films. The hybrid and QD films with the same CCE of 60% were aged at an environmental temperature of 25°C and with a 10 mA injection current light-emitting diode source. The CCE and luminous efficacy that are gained by the hybrid film increased by 42.8% and 24.5%, respectively, when compared with that gained by the QD film after aging for the same time period of approximately 65 h. In addition, the hybrid film can effectively suppress the red-shift phenomenon of the QD light spectra, as well as an expansion of the full-width at half maximum. Consequently, these BATF-QD hybrid films with excellent optical performance and stability show great potential for illumination and display applications.
Highlights
Quantum dots (QDs) have several advantages for lighting applications, including high quantum yield, high color purity, and easy manufacture
The results indicate that the conversion efficiency (CCE) can be increased by as much as 93% using 15 layers of blue anti-transmission film (BATF) under the same QD concentration
The same CCE can be achieved using BATF-QD hybrid films with a lower QD concentration when compared with standard QD films
Summary
Quantum dots (QDs) have several advantages for lighting applications, including high quantum yield, high color purity, and easy manufacture. The scattering effect that is introduced by particles with a high refractive index [21,22] or patterned structures [18] is used to improve the CCE by increasing the blue light path in the QD films These methods increase the light path of the QD light in the QD films, leading to higher reabsorption loss and heat power generation from the QDs [23]. It is expected that any new solution for improving the CCE should simultaneously decrease reabsorption losses [20] Solving this problem is an important aspect in the development of high efficiency and stable QD-based LEDs. In this study, a blue anti-transmission film (BATF) is introduced in order to improve the CCE and stability of QD films.
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