Liquid crystal display (LCD) with light emitting diodes (LEDs) backlight units have been well-received for LED display purposes. The commonly used which have been adopted for utilization in various LCD devices, from LCD televisions to mobile phones are into the play for over a decade now. However, given the complexity of their configuration, constituted of multiple quantum wells (MQWs), nucleation layers, carrier obstructing layers and strain relief framework for moderation of the strain induced by the hetero-epitaxial growth, the evaluation of the mechanisms persuading their performance is complicated, and generally involves the use of computer-assisted elucidations.
A concoction consisting of lighting and display with carbon may appear like a science fiction, but carbon quantum dots sized(< 10 nm) has become apparent as a potential material to bring low-cost light-emitting applications into reality, due to carbon’s high structural reliance, copiousness, cost-effectiveness, and environmental-friendliness.
Even so, CQDs are acquired as a sneaking suspicion — delivering broad emission and lousy color-purity with exceeding full width at half maximum (FWHM) (ordinarily 80 nm), thus restricting its execution in display technology wherein high Color-clarity/tuning is a quintessence.
With immense efforts in scrutinizing the CQDs optical properties, Louzhen Fan, the originator of the unique, the unvanquished concept of triangular CQDs-distributing light emission (from blue to red) with an unmatched narrow bandwidth of 30 nm, has turned out to be a triumphant in accomplishing the amelioration nullifying this suspicion.
Tremendous progress has been in her experiments in the field of achieving a logical consolidation of novel triangular CQDs from a triangulogen. Elaborate conceptual computations displays high structural stability and high delocalized charges of the T-CQDs.
Meticulously establishing the triangular structure and the narrow bandwidth emission of NBE-T-CQDs reveals to have remarkably reduced the electron-phonon coupling, thus giving rise to the narrow bandwidth emission and spectacular stability both on shelf and in operation.
Owing to the exciting technical challenge, Louzhen instituted the use of HAADF-STEM which is a key element for the characterization of the NBE-T-CQDs. It is for the first time that the acute-aberration fixed HAADF-STEM NBE-T-CQDs images were obtained on carbon materials (defect-free, clear-cut graphene crystalline structure with an evident triangular shape) which could previously be obtained only on metals and metal oxides.
What is more to her designing goals, — the triangular NBE-T-CQDs that also represents the seldom seen strong high color-purity, two-photon fluorescence (TPF), narrow bandwidth from blue to red (FWHM of 30 nm), with a quantum yield up to 72%, which possibly makes it a matchless optical-gain media for high-performance frequency-up-conversion tunable lasers.
For the first time they see that a triangular centric NBE-T-CQDs concept offers the capability of color-tuning in real time and without the use of color filters. The obtained results imply great potential of NBE-T-CQDs as a well-developed, structurally stable semiconductor for various display and solid-state light source applications.
Novel structures incorporating crystals are an exhilarating technical challenge and commercial opportunity for display and lighting applications. Recent developments by the author in the field shows that coherence and luminance of NBE-T-CQDs based LEDs can be superlative to conventional, organic and metal quantum dot LEDs.
A comprehensive compositional and optical characterization together with theoretical computations demonstrates that the crystalline brilliance and the molecular purity of the triangular CQDs are cardinal to the high color-purity.
Multicolored LEDs based on the NBE-T-CQDs have revealed to display excellent stability, high color-purity, and high-performance with maximum luminance of 4762 cd m−2 and current efficiency of 5.11 cd A-1.
Moreover, the FWHM of 30 nm with multicolored narrow bandwidth emission from triangular CQDs with a quantum yield of up to 55-72% set the stage towards making headway for next-generation high-performance CQDs-based light-emitting diodes.
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