Tunable white light emission of a large area film-forming macromolecular complex with a high color rendering index

Abstract

The technological route of pre-polymerization and post-coordination was employed to obtain a rapid film-forming macromolecular complex emitting white light by simultaneously combining poly (styrene-co-glycidyl methacrylate) with three primary color complexes [r(R)/g(G)/b(B)]. The white light emission of the macromolecular complex was realized by tuning the ratios of the trichromatic complexes or altering excitation wavelengths. Upon excitation at 365 nm, macromolecular complex 5 with R:G:B = 1:10:1 exhibits three discrete characteristic peaks at 458 (blue emission), 543 (green emission), and 612 (red emission) nm. The corresponding CIE coordinates of (0.332, 0.337) are in close proximity to pure white light (0.330, 0.330). Macromolecular complex 3 (R:G:B = 1:8:0.5) achieves white emission being excited at the wavelength of 375 nm. Macromolecular complex 5 was melted at 140 °C, dropped on a 365 nm UV chip, and then cooled to room temperature to fabricate an LED device with CIE coordinates of (0.35, 0.34), CCT of 5306 K, and CRI of 95.2. The prepared macromolecular complex film further shows vivid color reproduction for real objects, confirming the high rendering index of the macromolecular complex. In addition, the macromolecular complex remains stable up to 272.6 °C, meeting the requirements of operating temperature for LEDs. This work establishes a rapid film-forming macromolecular complex with potential application in NUV-WLEDs.

Enhance the chromatic uniformity and luminous efficiency of WLEDs with triple-layer remote phosphor structures

“…In 2017, Nhan and his partners reported that structure with red phosphor SrO.3B2O3:Sm 2+ in the dual remote phosphor can enhance light output by 17% in comparison to the conventional phosphor configuration. Besides, in the stable concentration of red phosphor SrO.3B2O3:Sm 2+ , the structure can achieve 5% higher color rendering index (CRI) than the mixed phosphor WLEDs [22,23]. However, this study just showed the better results of CRI which is one of elements using to evaluate the color quality.…”

The effectiveness of MgCeAl11O19:Tb3+ phosphor in enhancing the luminous efficacy and color quality of multi-chip white LEDs

“…In order to confirm the optical properties of phosphor compounding, the scattering coefficient μsca are calculated based on the Mie theory [25]. The following expressions demonstrate the connection among the three elements: the scattering coefficient (SC), the wavelength, and the size of MgCeAl11O19:Tb 3+ particles.…”

The Application of Calcium Carbonate CaCO3 and Titania TiO2 for Color Homogeneity and Luminous Flux Enhancement in PC-LEDs

“…HfO 2 /SiO 2 DBR film, on the other hand, can lower the color deviation from 1758 K to 280 K at 5000 K CCT [7]. Finally, the micro-patterned is also effective by deducting about 441 K color deviation value at 5337 K CCT [8]. The effects of these mentioned methods in boosting spatial color homogeneity are profound and have been tested, however, the complexity in fabrication as well as the high manufacturing cost prevent them from being widely used.…”