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Issue 48, 2019
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High efficiency color-temperature tunable organic light-emitting diode

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Rhythmic lighting with varying color-temperature and brightness like that of diurnal sunlight has now been recognized to be extremely crucial to human health. In this study, we demonstrate a high-efficiency and high light-quality organic light-emitting diode (OLED) with color temperature tunable from the 1700 K of dusk-hue, 1900 K of candles and 2500 K of incandescent bulbs to 3000 K of warm-white light. The color-temperature tunable OLED device was achieved by utilizing a hybrid system and inserting a carrier modulation layer (CML) between the emission layers. In addition, the electron-rich charge transport properties of EML-1, facilitated via a 3 : 1 composition ratio of the 3P-T2T host to TPD-15 co-host, played a crucial role in tuning the desirable low-color temperature of the fabricated OLED devices. The current efficiency, power efficacy, and spectrum resemblance index (SRI) of the studied OLED are 40.2 cd/A, 40.3 lm W−1 and 82.2 at 1000 cd m−2, respectively. The resultant devices show great potential to advance the study and development of physiologically friendly lighting and enable a successful commercial OLED lighting product in the market.

Graphical abstract: High efficiency color-temperature tunable organic light-emitting diode

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Publication details

The article was received on 13 Oct 2019, accepted on 06 Nov 2019 and first published on 08 Nov 2019

Article type: Paper
DOI: 10.1039/C9TC05603C
J. Mater. Chem. C, 2019,7, 15322-15334

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    High efficiency color-temperature tunable organic light-emitting diode

    S. Shih, J. Jou, S. D. Chavhan, T. Su, C. Yuan, J. Wen, P. Chen, F. Tung and Y. Tasi, J. Mater. Chem. C, 2019, 7, 15322
    DOI: 10.1039/C9TC05603C

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