Cyan Broad-Band Emission Phosphor with Scandium Silicon Multiple-Ring Structure for White Light-Emitting Diodes and Field Emission Displays

Abstract

Silicate phosphor KBaScSi 2 O 7 :Ce 3+ (KBSS:Ce 3+ ), as a novel material, has been prepared by the solid-state method in this study. The crystal structure, luminescent properties, thermal stability, and cathodoluminescence (CL) properties of this material were analyzed systematically. It concludes that the phosphor can emit cyan light with emission peak at 509 nm under n-UV light excitation (300−400 nm). By coating KBSS:Ce 3+ with a redemitting CaAlSiN 3 :Eu 2+ on a n-UV (365 nm) light-emitting diode (LED) chip, the intense warm white light with high R A (83.4) and low CCT (3652) can be produced under a 350 mA forward bias current.In addition, the CL performance shows that KBSS:0.10Ce 3+ has high saturation current and voltage and good color stability under low voltage conditions. All these results indicate that KBSS:Ce 3+ phosphor will be very promising in LED and field emission display applications.

Intense Luminescence and Good Thermal Stability in a Mn2+-Activated Mg-Based Phosphor with Self-Reduction

“…As an emerging lighting source, white light-emitting diodes (wLEDs) have developed rapidly on account of their broad range of applications and their noteworthy characteristics such as high efficiency, eco-friendliness, and energy saving capacity. − Phosphor is a dominating component of LED devices and has significant effect on the quality of LED lighting and display . YAG:Ce 3+ (Y 3 Al 5 O 12 :Ce 3+ ) is used in commercial wLEDs, and the white light emission is realized by mixing the blue light of LED and the yellow light of excited phosphor emission.…”

Challenges and Strategies to Design Phosphors for Future White Light Emitting Diodes

“…59,60 Figure 6b shows one such pc-WLED where the cyan-emitting [Na 0.5 K 0.5 ][Li 3 Si]O 4 :Eu 2+ (NKLSO:Eu 2+ ) phosphor has been added in the blend. 59 The combination of cyan light, with the blue light of the InGaN chip, yellow-emitting YAG:Ce 3+ , and red-emitting KSF:Mn 4+ produces white light with a desired higher CRI value and a lower CCT value. Figure 6b shows a decrease in the relative intensity of the blue (455 nm) and yellow (550 nm) light compared to results in Figure 6a.…”

“…This cyan gap is an obstacle in realizing the full-spectrum lighting that resembles sunlight. Therefore, researchers got motivated to develop cyan-emitting phosphors overcoming the cyan gap. , Figure b shows one such pc-WLED where the cyan-emitting [Na 0.5 K 0.5 ]­[Li 3 Si]­O 4 :Eu 2+ (NKLSO:Eu 2+ ) phosphor has been added in the blend . The combination of cyan light, with the blue light of the InGaN chip, yellow-emitting YAG:Ce 3+ , and red-emitting KSF:Mn 4+ produces white light with a desired higher CRI value and a lower CCT value.…”

Layer-structure-suppressed concentration quenching of Dy3+ luminescence and the realization of a single phase white light-emitting phosphor cooperated with Tm3+

“…The first way is to dope a single rare earth activated ion, which uses broad emission peaks of f-d transitions or multiple f-f level transitions that forms combined emissions to obtain white light. 13,14 The problem of this method is that the former encounters the same situation as the commercial YAG phosphor, lacking red light components, while the latter suffers the contradiction between cross-relaxation and doping concentration. The second way is to co-dope two or three rare earth activated ions, and each luminescent center realizes white light by adjusting the rate of energy transfer.…”