title: Environmentally benign technology for efficient warm-white light emission.
abstract: Nowadays efficient down conversion for white light emission is mainly based on rare-earth doped phosphors or cadmium-containing quantum dots. Although they exhibit high luminescence efficiency, the rare-earth mining and cadmium pollution have so far led to extremely high environmental cost, which conflicts the original purpose of pursuing efficient lighting. Here, we explore a new strategy to achieve efficient luminescence conversion based on polymer-decorated nanoparticles. The ZnO and Mn(2+) doped ZnS nanoparticles are encapsulated by poly(9,9-di-n- hexylfluorenyl-2,7-diyl). The resultant core-shell nanocomposites then encompass three UV-to-visible luminescence conversion routes for photon emissions at blue, green, and orange colors, respectively. As a result, the color temperature is widely tunable (2100 K ~ 6000 K), so candle light or pure white light can be generated. The quantum yield up to 91% could also be achieved. Such rare-earth-element free nanocomposites give the bright perspectives for energy-saving, healthy, and environmentally benign lighting.
authors.affiliation: 1] Graduate Institute of Photonics and Optoelectronics, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei, 10617 Taiwan (R.O.C.) [2] Innovative Photonics Advanced Research Center, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei, 10617 Taiwan (R.O.C.).
authors.forename: Pin-Chun
authors.initials: PC
authors.lastname: Shen
authors.affiliation: Graduate Institute of Photonics and Optoelectronics, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei, 10617 Taiwan (R.O.C.).
authors.forename: Ming-Shiun
authors.initials: MS
authors.lastname: Lin
authors.affiliation: 1] Graduate Institute of Photonics and Optoelectronics, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei, 10617 Taiwan (R.O.C.) [2] Innovative Photonics Advanced Research Center, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei, 10617 Taiwan (R.O.C.) [3] Graduate Institute of Electronics Engineering, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei, 10617 Taiwan (R.O.C.) [4] Department of Electrical Engineering, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei, 10617 Taiwan (R.O.C.).
authors.forename: Ching-Fuh
authors.initials: CF
authors.lastname: Lin