High efficiency color-temperature tunable organic light-emitting diode. Issue 48 (26th November 2019)

• Record Type: Journal Article
• Authors: Shih, Sheng-Hsu; Jou, Jwo-Huei; Chavhan, Sudam D.; Su, Tsung-Hao; Yuan, Chih-Hsien; Wen, Jia-Wei; Chen, Pin-Ren; Tung, Fu-Ching; Tasi, Yung-Cheng
• Is Part Of: Journal of materials chemistry. Volume 7:Issue 48(2019)
• Page Start: 15322
• Page End: 15334
• Publication Date: 2019-11-26
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c9tc05603c
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : Rhythmic lighting with varying color-temperature and brightness like that of diurnal sunlight has now been recognized to be extremely crucial to human health. Abstract : 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.