Thermally　activated　delayed　fluorescence　(TADF)　materials　with　through-space　charge　transfer　(TSCT)　have　recently　attracted　extensive　attention.　However,　how　to　rationally　design　high-performance　TSCT-TADF　emitters　with　small　Delta(EST),　high　photoluminescence　quantum　yields　(PLQYs)　and　high　stability　remains　challenging.　Herein,　two　triptycene-derived　TADF　molecules　bearing　ortho-donor　(D)-acceptor　(A)　conformations　are　designed　and　characterized.　These　emitters　exhibit　unique　V-shaped　face-to-face　D-A　alignments　with　significant　intramolecular　D-A　interactions,　which　mediate　TSCT　between　the　D　and　A　moieties　in　addition　to　the　throughbond　charge　transfer　(TBCT)　and　facilitate　realizing　small　Delta(EST)　and　high　efficiencies.　Meanwhile,　the　rigid　3D　triptycene　scaffold　endows　the　emitters　with　excellent　thermal　stability　and　high　film-formation　quality.　These　TADF　emitters　exhibit　small　Delta(EST)　of　6.7　and　10.8　meV　and　high　photoluminescence　quantum　yields　of　0.80　and　0.40　in　doped　films,　respectively.　The　doped　OLEDs　employing　these　emitters　achieve　high　external　quantum　efficiencies　up　to　20.5%.