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Photonics Research, Volume. 7, Issue 5, 579(2019)

Hybrid-type white LEDs based on inorganic halide perovskite QDs: candidates for wide color gamut display backlights

Chih-Hao Lin1, Akta Verma2, Chieh-Yu Kang1, Yung-Min Pai1, Tzu-Yu Chen1, Jin-Jia Yang1, Chin-Wei Sher3, Ya-Zhu Yang4, Po-Tsung Lee1, Chien-Chung Lin5, Yu-Chuan Wu6,7, S. K. Sharma2, Tingzhu Wu8,9、*, Shu-Ru Chung4,10、*, and Hao-Chung Kuo1,11、*
Author Affiliations
  • 1Department of Photonics and Institute of Electro-Optical Engineering, College of Electrical and Computer Engineering, Taiwan Chiao Tung University, Hsinchu 30010, China
  • 2Department of Applied Physics, Indian Institute of Technology (Indian School of Mines), Dhanbad-826004, India
  • 3Fok Ying Tung Research Institute, Hong Kong University of Science and Technology, Hong Kong, China
  • 4Department of Materials Science and Engineering, Taiwan Formosa University, Yunlin 63201, China
  • 5Institute of Photonic System, College of Photonics, Taiwan Chiao Tung University, Tainan 711, China
  • 6Department of Materials and Mineral Resources Engineering, Taiwan Taipei University of Technology, Taipei 10608, China
  • 7Department of Chemical and Materials Engineering, Chinese Culture University, Taipei 11114, China
  • 8Department of Electronic Science, Fujian Engineering Research Center for Solid-state Lighting, Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient Devices, Xiamen University, Xiamen 361005, China
  • 9e-mail: wutingzhu@xmu.edu.cn
  • 10e-mail: srchung@nfu.edu.tw
  • 11e-mail: hckuo@faculty.nctu.edu.tw
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    Process flow of perovskite QDs-based WLEDs: (a) liquid type, (b) solid type, and (c) hybrid type.

    Fig. 1. Process flow of perovskite QDs-based WLEDs: (a) liquid type, (b) solid type, and (c) hybrid type.

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    UV–Vis absorption and PL emission spectrum of (a) CsPbBr3 green and (b) CsPbBr1.2I1.8 red PQDs; the insets show photographs of green and red PQDs. (c) EL spectrum of liquid-type LEDs, which shows an intermediate stage due to mixing of red and green PQDs.

    Fig. 2. UV–Vis absorption and PL emission spectrum of (a) CsPbBr3 green and (b) CsPbBr1.2I1.8 red PQDs; the insets show photographs of green and red PQDs. (c) EL spectrum of liquid-type LEDs, which shows an intermediate stage due to mixing of red and green PQDs.

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    (a) EL spectrum and (b) color gamut on CIE1931 for the solid-type WLED.

    Fig. 3. (a) EL spectrum and (b) color gamut on CIE1931 for the solid-type WLED.

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    (a) EL spectrum and (b) color gamut on CIE1931 for the hybrid-type WLED.

    Fig. 4. (a) EL spectrum and (b) color gamut on CIE1931 for the hybrid-type WLED.

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    Current versus luminance efficiency of solid- and hybrid-type WLEDs.

    Fig. 5. Current versus luminance efficiency of solid- and hybrid-type WLEDs.

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    Surface temperature images of WLED. (a) Temperature versus current plot for two different QDs devices. Thermal images for (b) solid type and (c) hybrid type at 100 mA.

    Fig. 6. Surface temperature images of WLED. (a) Temperature versus current plot for two different QDs devices. Thermal images for (b) solid type and (c) hybrid type at 100 mA.

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    Emission spectra of (a) solid-type and (b) hybrid-type WLEDs under various operation durations.

    Fig. 7. Emission spectra of (a) solid-type and (b) hybrid-type WLEDs under various operation durations.

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    Stability of solid- and hybrid-type WLEDs.

    Fig. 8. Stability of solid- and hybrid-type WLEDs.

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    Chih-Hao Lin, Akta Verma, Chieh-Yu Kang, Yung-Min Pai, Tzu-Yu Chen, Jin-Jia Yang, Chin-Wei Sher, Ya-Zhu Yang, Po-Tsung Lee, Chien-Chung Lin, Yu-Chuan Wu, S. K. Sharma, Tingzhu Wu, Shu-Ru Chung, Hao-Chung Kuo, "Hybrid-type white LEDs based on inorganic halide perovskite QDs: candidates for wide color gamut display backlights," Photonics Res. 7, 579 (2019)

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    Paper Information

    Category: Optical Devices

    Received: Dec. 28, 2018

    Accepted: Mar. 11, 2019

    Published Online: May. 8, 2019

    The Author Email: Tingzhu Wu (wutingzhu@xmu.edu.cn), Shu-Ru Chung (srchung@nfu.edu.tw), Hao-Chung Kuo (hckuo@faculty.nctu.edu.tw)

    DOI:10.1364/PRJ.7.000579

    Topics

    laser devices and laser physics
    Lasers and Laser Optics
    Laser physics
    laser manufacturing
    Instrumentation, Measurement and Metrology