Fabrication of a Wide Color Gamut pc-WLED Surpassing 107% NTSC Based on a Robust Luminescent Uranyl Phosphate

Abstract

The development of green-light-emitting phosphors with combined narrow emission band, high quantum efficiency, and high chemical resistance remains to date one of the most challenging issues for wide color gamut WLED fabrication. In this work, uranyl ion (UO2 2+) endowed with broad and intense absorption capacity in blue region was incorporated into a rigid phosphate skeleton (namely HUP-2, formulated as (H3O)­UO2PO4·(H2O)3) and results in near-unity internal and external quantum efficiencies (IQE/EQE) of up to 93.66 and 82.05% under the excitation of 282 nm, respectively. Benefiting from the structural robustness, the emission of HUP-2 displays excellent resistance to humidity, UV to visible light irradiation, and elevated temperature. The distinct electronic structure of UO2 2+ coupled with vibration gives rise to narrow emission bands (full width at half-maximum peak, FWHM = 43 nm), thus leading to a wide color gamut reaching 107.6% of the National Television System Committee standard (NTSC) of the fabricated pc-WLED. This work sheds light on the great potential of UO2 2+-containing phosphor for the application in liquid crystal display (LCD) backlighting.

Efficient Ce3+ → Tb3+ energy transfer pairs with thermal stability and internal quantum efficiency close to unity

“…2,8 Apparently, the exploration of green phosphors with the superior feature of ultra-narrow emission is crucial to promote the LCD industry. 9,10 Trivalent terbium (Tb 3+ ) is well-documented to activate green emission around 543 nm in most hosts. 11,12 The intrinsic 4f-4f transitions allow it to extremely narrow emission lines with an FWHM of merely ∼10 nm.…”

“…2,8 Apparently, the exploration of green phosphors with the superior feature of ultra-narrow emission is crucial to promote the LCD industry. 9,10…”

Ultrasensitive and Selective Detection of Uranium by a Luminescent Terbium–Organic Framework

“…Large adsorption capacity and fast adsorption kinetics can be easily achieved in MOFs compared with traditional materials. On the other hand, the incorporation of emissive metal nodes (e.g., Eu 3+ , Tb 3+ , and UO 2 2+ ) and organic ligands may facilely functionalize the MOFs with luminescent capability. − These advanced performances offer the opportunity for sensitive and fast detection of guest species adsorbed into the pore of the framework. Currently, luminescent MOFs are reported capable of detecting heavy metals, − organic pollutants, , ionizing radiation, − and gas molecules. , However, this class of materials is less investigated for uranium detection.…”

Efficient Blue–Violet Phosphor with Small Stokes‐Shift for Full‐Spectrum Lighting

“…Benefiting from the merits of longer service lifetime, lower energy consumption, and better environmental friendliness, phosphor-converted white light-emitting diode (pc-WLED) has become a widespread lighting technology. [1][2][3][4] Recent demands toward a healthy lifestyle have led the investigation of pc-WLED to high-quality full-spectrum lighting. [5][6][7] Among various methods, packaging based on a commercial 365 nm N-UV chip is one of the most promising technologies because different color emitting phosphors can be efficiently excited by it and this gives lighting devices many possibilities.…”