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Interface-Free Area-Scalable Self-Powered Electroluminescent System Driven by Triboelectric Generator.

Wei XY, Kuang SY, Li HY, Pan C, Zhu G, Wang ZL - Sci Rep (2015)

Bottom Line: Self-powered system that is interface-free is greatly desired for area-scalable application.The TEG provides high-voltage alternating electric output, which fits in well with the needs of the TFEL lamp.It is demonstrated that multiple types of TEGs are applicable to the self-powered system, indicating that the system can make use of diverse mechanical sources and thus has potentially broad applications in illumination, display, entertainment, indication, surveillance and many others.

View Article: PubMed Central - PubMed

Affiliation: Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing, 100083, China.

ABSTRACT
Self-powered system that is interface-free is greatly desired for area-scalable application. Here we report a self-powered electroluminescent system that consists of a triboelectric generator (TEG) and a thin-film electroluminescent (TFEL) lamp. The TEG provides high-voltage alternating electric output, which fits in well with the needs of the TFEL lamp. Induced charges pumped onto the lamp by the TEG generate an electric field that is sufficient to excite luminescence without an electrical interface circuit. Through rational serial connection of multiple TFEL lamps, effective and area-scalable luminescence is realized. It is demonstrated that multiple types of TEGs are applicable to the self-powered system, indicating that the system can make use of diverse mechanical sources and thus has potentially broad applications in illumination, display, entertainment, indication, surveillance and many others.

No MeSH data available.


Measurement results of electroluminescence spectrum of the system when driven by the rotary TEG.(a) Normalized intensity of the electroluminescence spectrum at different driving frequencies. Inset: peak normalized intensity as a function of the frequency. (b) Normalized intensity of the electroluminescence spectrum at different driving voltages. Inset: peak normalized intensity as a function of the voltage. Normalized intensity of the electroluminescence spectrum when multiple lamps in parallel connection. (c) and in serial connection (d) are used. Insets: peak normalized intensity as a function of the number of lamps.
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f3: Measurement results of electroluminescence spectrum of the system when driven by the rotary TEG.(a) Normalized intensity of the electroluminescence spectrum at different driving frequencies. Inset: peak normalized intensity as a function of the frequency. (b) Normalized intensity of the electroluminescence spectrum at different driving voltages. Inset: peak normalized intensity as a function of the voltage. Normalized intensity of the electroluminescence spectrum when multiple lamps in parallel connection. (c) and in serial connection (d) are used. Insets: peak normalized intensity as a function of the number of lamps.

Mentions: Factors that may influence the luminescence intensity of the self-powered system were investigated by using the rotary TEG. First, the current frequency determines the luminescence intensity to a large extent. As shown in Fig. 3a, higher frequency leads to higher output of the luminescence, which is attributed to the faster-changing electric field that can accelerate electrons in the phosphor to a larger extent23. Since the current frequency is controlled by the rotation rate of the TEG, the input from external mechanical energy then plays a critical role in affecting the luminescence intensity. Second, the open-circuit voltage of the TEG is another important governing factor in that higher voltage means more induced charges pumped onto the ACTFEL lamp and thus higher electric filed for exciting the photon emission24. As the open-circuit voltage increases from 100 V to 300 V, the luminescence intensity experiences a 25-fold enhancement, as demonstrated in Fig. 3b. Third, when multiple ACTFEL lamps (1 cm by 1 cm) are used as a load simultaneously, the way they are connected can also considerable influence the luminescence intensity. If parallel connection is employed, the intensity drops exponentially as more lamps are added. Compared to the case of a single lamp, only 2.2% of the luminescence intensity can be obtained when five lamps of the same size are connected in parallel (Fig. 3c). On the contrary, serial connection is much more favorable for light output of the self-powered system. As shown in Fig. 3d, as much as 18.3% of the luminescence intensity can be still preserved even when five ACTFEL lamps are used.


Interface-Free Area-Scalable Self-Powered Electroluminescent System Driven by Triboelectric Generator.

Wei XY, Kuang SY, Li HY, Pan C, Zhu G, Wang ZL - Sci Rep (2015)

Measurement results of electroluminescence spectrum of the system when driven by the rotary TEG.(a) Normalized intensity of the electroluminescence spectrum at different driving frequencies. Inset: peak normalized intensity as a function of the frequency. (b) Normalized intensity of the electroluminescence spectrum at different driving voltages. Inset: peak normalized intensity as a function of the voltage. Normalized intensity of the electroluminescence spectrum when multiple lamps in parallel connection. (c) and in serial connection (d) are used. Insets: peak normalized intensity as a function of the number of lamps.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4559893&req=5

f3: Measurement results of electroluminescence spectrum of the system when driven by the rotary TEG.(a) Normalized intensity of the electroluminescence spectrum at different driving frequencies. Inset: peak normalized intensity as a function of the frequency. (b) Normalized intensity of the electroluminescence spectrum at different driving voltages. Inset: peak normalized intensity as a function of the voltage. Normalized intensity of the electroluminescence spectrum when multiple lamps in parallel connection. (c) and in serial connection (d) are used. Insets: peak normalized intensity as a function of the number of lamps.
Mentions: Factors that may influence the luminescence intensity of the self-powered system were investigated by using the rotary TEG. First, the current frequency determines the luminescence intensity to a large extent. As shown in Fig. 3a, higher frequency leads to higher output of the luminescence, which is attributed to the faster-changing electric field that can accelerate electrons in the phosphor to a larger extent23. Since the current frequency is controlled by the rotation rate of the TEG, the input from external mechanical energy then plays a critical role in affecting the luminescence intensity. Second, the open-circuit voltage of the TEG is another important governing factor in that higher voltage means more induced charges pumped onto the ACTFEL lamp and thus higher electric filed for exciting the photon emission24. As the open-circuit voltage increases from 100 V to 300 V, the luminescence intensity experiences a 25-fold enhancement, as demonstrated in Fig. 3b. Third, when multiple ACTFEL lamps (1 cm by 1 cm) are used as a load simultaneously, the way they are connected can also considerable influence the luminescence intensity. If parallel connection is employed, the intensity drops exponentially as more lamps are added. Compared to the case of a single lamp, only 2.2% of the luminescence intensity can be obtained when five lamps of the same size are connected in parallel (Fig. 3c). On the contrary, serial connection is much more favorable for light output of the self-powered system. As shown in Fig. 3d, as much as 18.3% of the luminescence intensity can be still preserved even when five ACTFEL lamps are used.

Bottom Line: Self-powered system that is interface-free is greatly desired for area-scalable application.The TEG provides high-voltage alternating electric output, which fits in well with the needs of the TFEL lamp.It is demonstrated that multiple types of TEGs are applicable to the self-powered system, indicating that the system can make use of diverse mechanical sources and thus has potentially broad applications in illumination, display, entertainment, indication, surveillance and many others.

View Article: PubMed Central - PubMed

Affiliation: Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing, 100083, China.

ABSTRACT
Self-powered system that is interface-free is greatly desired for area-scalable application. Here we report a self-powered electroluminescent system that consists of a triboelectric generator (TEG) and a thin-film electroluminescent (TFEL) lamp. The TEG provides high-voltage alternating electric output, which fits in well with the needs of the TFEL lamp. Induced charges pumped onto the lamp by the TEG generate an electric field that is sufficient to excite luminescence without an electrical interface circuit. Through rational serial connection of multiple TFEL lamps, effective and area-scalable luminescence is realized. It is demonstrated that multiple types of TEGs are applicable to the self-powered system, indicating that the system can make use of diverse mechanical sources and thus has potentially broad applications in illumination, display, entertainment, indication, surveillance and many others.

No MeSH data available.