Wenge Xiao,Endale T. Basore,Guojun Zheng,Xiaofeng Liu,Beibei Xu,Jianrong Qiu
The brightness of doped luminescent materials is usually limited by the ubiquitous concentration quenching phenomenon resulting in an intractable tradeoff between internal quantum efficiency and excitation efficiency. Here, an intrinsic suppression of concentration quenching in sensitized luminescent systems, by exploiting the competitive relationship between light emitters and quenchers in trapping excitation energies from sensitizers, is reported. Although Cr 3+ sensitizers and trivalent lanthanide (Ln 3+ , Ln = Yb, Nd, and Er) emitters themselves are highly susceptible to concentration quenching, the unprecedentedly high-brightness luminescence of Cr 3+ –Ln 3+ systems is demonstrated in the short-wave infrared (SWIR) range employing high concentrations of Cr 3+ , whereby a record photoelectric efficiency of 23% is achieved for SWIR phosphor-converted light-emitting diodes, which is about twice as high as those previously reported. The results underscore the beneficial role of emitters in terminating excitation energies, opening up a new dimension for developing efficient sensitized luminescent materials.
Yinhua Wang,Songchao Bai,Hao Liang,Chao Li,Tianya Tan,Gang Yang,Jiwei Wang
Lead-free double perovskites have become the research hotspot in the optoelectronic fields. Then, it is a challenge to utilize the lattice doping by different rare earth ions with rich energy level and unique luminescence for emerging photonic applications. Here, we successfully prepared Sb 3+ and Ln 3+ ions doped Cs 2 NaYCl 6 single crystals (SCs), bringing tunable bright luminescent emissions of blue, red, and white light, the highest photoluminescence quantum yield (PLQY) is up to 58.33%. Based on excellent and tunable luminescent properties, the multicolor light-emitting diodes (LEDs) applications for the rare earth-based double perovskite SCs were designed. These findings indicate that rare earth-based double perovskite will provide a broader application space for lighting.
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