Program controlling the emission color of blend polymer phosphors containing Eu(III), Tb(III), Be(II) ions for WLEDs

Abstract Through of the technique route of pre-coordination and post-polymerization and final-blend by program controlling from vinyl-functionalized RGB complex monomers [Eu(TTA)3(UA)](TTA = 2-thenoyltrifluoroacetone, UAH= Undecenoic acid), [Tb(2-ABA)3(UA)](2-ABAH = 2-Aminobenzoic acid), [Be (BTZ) (MAA)](BTZ=Benzothiazole, MAA = Methylacrylic acid) with Methyl methacrylate(MMA) to synthesize the monochrome polymers poly(MMA-co-Eu(TTA)3(UA)) (abbr. PMEu), poly(MMA-co-Tb(2-ABA)3(UA)) (abbr. PMTb), poly(MMA-co- Be (BTZ) (MAA)) (abbr. PMBe), and finally obtain the white-light blend-polymer phosphors by program controlling. The monochrome polymers PMEu, PMTb, PMBe have 1.69, 11.53, 10.57 times of the luminescent intensity as RGB complex monomers. The serial blend polymer phosphors have the emission located in the white light region with the CIE coordinates close to the calculated ones running by the program. When the RGB ratio = 1:1.38:0.46, the experiment coordinates are situated at (0.32, 0.33), being close to the theoretical coordinates of (0.33, 0.33), proving that the program controlling can guide the tuning of the chromaticity of the emission color. The LED device was fabricated by the blend polymer phosphor with the RGB ratio of 1:1.38:0.46 matched with the chip of 365 nm wavelength, the color temperature is 6444 K, the color rendering index 84.2, and the luminance 12740 cd/m2 at 3.2 V. This research develops an approach of pre-coordination, post-polymerization and final-blend by program controlling that not only improves the luminescent intensity, but also suppresses the energy transfer, and more importantly achieves the precise adjustment to the white light.