Modern telecommunications rely on the transmission and manipulation of optical signals. Optical amplification plays a vital part in this technology, as all components in a real telecommunications system produce some loss. The two main issues with present amplifiers, which rely on erbium ions in a glass matrix, are the difficulty in integration onto a single substrate and the need of high pump power densities to produce gain. Here we show a potential organic optical amplifier material that demonstrates population inversion when pumped from above using low-power visible light. This system is integrated into an organic light-emitting diode demonstrating that electrical pumping can be achieved. This opens the possibility of direct electrically driven optical amplifiers and optical circuits. Our results provide an alternative approach to producing low-cost integrated optics that is compatible with existing silicon photonics and a different route to an effective integrated optics technology.
It is expected that fluorinated organic erbium(III) complexes, of interest for optical applications at λ = 1.5 μm, have improved performance with respect to hydrogenated counterparts. However, the intrinsic radiative properties (including the absorption/emission line strengths) of organic Er 3+ complexes have not been systematically studied and compared up to date. This has precluded the observation of opto-structural correlations as well as a proper characterization of the infrared f-f transitions and thus a lack of meaningful figures for the optical efficiency of these materials at the 1.5 μm emission. We have performed a complete opto-structural correlation study of the oscillator strengths of the f-f transitions of hydrogenated and fluorinated organic erbium(III) complexes, including a Judd-Ofelt analysis. The Judd-Ofelt analysis on the crystals has allowed the study of the interdependence of the chemical nature, structure, and spectroscopic behavior. We observe clear trends that can help the design and understanding of these important infrared emitters for phosphor and opto-electronic applications.
The past few decades have brought a rapid emergence of research related to paradoxical leadership behavior (PLB), yet extant research remains scattered, inconsistent and somewhat contradictory. This meta-analysis examines the association between PLB and follower/team outcomes, specifically exploring PLBs incremental validity over other established leadership styles, namely transactional, transformational and servant leadership, as well three competing mechanisms through which PLB elicits positive effects. Our findings demonstrate that PLB is consistently positively associated with follower in-role performance, organizational citizenship behavior, creativity, voice and innovation. However, while PLB showed consistent incremental effects over transactional leadership, its incremental validity in relation to transformational and servant leadership is less clear, with the exception of predicting innovation. Finally, we found evidence that PLB is related to follower behaviors via socio-cognitive (psychological safety), role-based (role clarity), and relational (LMX) mechanisms, with these effects varying as a function of the outcome. Based on our findings, we derive several important implications for PLB theory and key implications for future research.
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